People don't value things that are cheap or free. Anyone who has spent enough time doing work on commission knows this. If you set your price too low, you'll get customers of quality proportional to that price, some of whom will believe it's their right to ask the moon of you (or their money back). By raising your price, you won't have as many customers, but the customers you do keep will likely be high of quality and much easier to work with. Even if they request more work of you, they will likely make it worth your while.

I noticed this as an independent web developer. When I charged very little, all my clients believed they could make unlimited changes to the expectations of the project, no matter how impractical or time consuming. When I charged what at the time I thought was way more than I was actually worth, someone still ended up paying me and they actually respected my expertise while leaving me alone most of the time.