Ah someone beat me to Europa Report... Is Attack the Block scifi? I still haven't seen it but I LOVE the monsters in it

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I think it's because the movie industry is trying to save money on their budgets.

Even movies like Maleficent has some of it.
Though, there's some of it in Europa Report.

It would be definitely be nice to see some. And if it was like Avatar, woo!

Bio-luminescence is something that has always captivated me, as someone who is fascinated by nature, and pretty-coloured lights - seeing the two overlap is quite magical But indeed it's rare to find in sci-fi for all the reasons stated here already. Sci-fi movies often deal with societies, cities and machines which often distances the movie plot away from nature, this doesn't bother me with sci-fi movies based on a future earth, since earth's nature won't evolve or change much even in 1000 years from now (unless we did something drastic to it) but on alien planets I feel it's kinda wasted potential when one can get so creative with the nature of said alien worlds - both plants and animals (and maybe the intelligent aliens themselves).

To me, the most interesting thing about an alien world in a film would be the stuff that was there before humans arrived and started colonizing it, terraforming it, mining it etc (unless said world was just a Tattooine-esque desert) even when it does show you the nature, if it looks too much like an ordinary earth forest I feel kinda disappointed. Some scenes in Avatar did resemble this, but only by day, and even then - signature plants found in almost every scene (often background elements) clearly stood out as alien with their weird colours or forms even during the daytime scenes. In fact, I read that in the concept stages of Avatar's world-building, they were almost going go for cyan/aqua for the primary vegetation colour instead of green to make Pandora even more alien (aqua is one the most rarely-seen colour in earth's flowers and plants even in spite of it being so close to green) - I wish they did go for cyan But they were concerned this vegetation colour wouldn't have been as pleasant to the viewer as the familiar green hues we affiliate with healthy forests, and limited such colours only to the night time bio-luminescence of plants, specific creatures and the Na'vi themselves (which would have blended into their surroundings too much if this vegetation colour was chosen too).

It's also a matter of finding the right artists too. An overwhelming majority of sci-fi artists prefer to focus on machines, cities, aliens, robots, etc. There's a relatively small community of those who prefer thinking about the organisms of an alien world rather than the technology to get there. These artists fall under the category of Xenobiology or Speculative biology artists and decent ones are hard to find. But man, I love looking at some of what they come up with, but often they'll end up designing monsters and environments for games instead. But until these artists can take centre stage in the sci-fi movie industry which is still infatuated with mechs and dystopian hell-hole cities instead, we probably won't be getting anything on par with Avatar again until... Avatar 2

Things in nature that really exist I think can be very difficult to reproduce using CGI because it's very easy for the audience to tell if they're fake - since they've actually been seen in real life. So the CGI has to be spot-on or it comes off as cheesy and/or unrealistic. Hence why most CGI depicts things (like machines or aliens) that we've never actually seen, so the audience can't compare them. Even creatures that we've never seen before (like dinosaurs) can easily look 'unreal' as CGI because our brains are very good at picking up even the most subtle of errors when it comes to looking at animals and animal movements.

The critters in Edge of Tomorrow were luminescent iirc

Science Fiction tends to deal with the machines and the societies that it affects usually. 

maybe because a lot of scifi deal with technology more so then nature?

Avatar does deal with nature so you get to see their bioluminesant critters and plants which help give it's nature a truely alien look.

Oh and the new Godzilla has some as well.

I would watch Pacific Rim, you may like that, those creatures all have bioluminescence

Probally because the lighting effect, and such need to be all the more perfect in such, and most people who use CG mainly, are using CG as a means to avoid putting a lot of effort into their movies, not actually adding to them.

Avatar is a masterpiece of masterpieces, insane amounts of efforts on levels never before seen in "movie" making, went into detailing everything, to get it all to look perfect, so sadly you can't expect to be seeing this kind of stuff again, anytime soon(except perhaps Avatar 2 lol=case, and point)