Having worked retail for umpteen years, I've learned you can sell a lot of something cheap, or a few of something expensive, and wind up with the same amount of profit. Since digital models can be endlessly duplicated without incurring any measurable additional cost, it would make sense to keep the price low. suit-speak

If I see most characters selling around $10 (arbitrary number), and then see one for $2.50, I'd wonder what was wrong with it. If I saw one for $50, I'd think someone was crazy. An exception would be for a vendor who has established himself as exceptional in a particular niche. People are willing to pay more for, say, Stonemason's products.

Basically, pricing your items close to the average price for whatever it is, is a safe way to go.