All I can say is think of all the time and effort you put into the work and the overall quality. The minimum wage in the US is $8 per hour I think so if you should compare it to that. There's also the $1=80. Seeing how a lot of people don't know about , you can display the charge in dollar amount and provide a link to a point converter so the person can convert it themselves so they don't immediately think the prices are too high because they aren't.
yeah, that's good.. I read the comments below, regarding $25 and such. I wouldn't make it so low as 10 But don't make it so high as to no one will have an ability to buy it. In a buyer's point of view, its easy to say i'd so buy it, but really think that its not worth it. Try to measure though how LONG it takes you to make ONE, cause it will really accumulate to you not having enough time and thinking what your getting payed with is not worth the time you spend on it. Do trial and error, change them when you think you know your standard rate .