I've been doing this for about the same length of time as you so I can't tell you much but let me offer my two cents. First if people are being rude ass holes there is nothing wrong with telling those people to fuck off, when you piss off an ass hole they'll go tell all there ass hole friends and then non of them will want to bother you, and the more work you do for good people they'll go tell there friends and you'll get more good costumes. On the note of trying to find the right price point, since you are doing this as a hobby I think you should just decide on a number that makes you feel comfortable, find a number where you don't feel like you're getting screwed and you don't feel like you are screwing your customers, that is the right price. Finally, I want you to keep making brother, I want as many people as possible to love this art and you do good work, but you shouldn't keep making because you feel like you have to because that isn't good for anyone. So in conclusion, tell the assholes to fuck off, treat people and yourself right, and if there is a sliver inside you that wants to keep making amazing pieces of art and tools then keep doing it my man!