Ask HN: Pricing dead zone: 300$-3000$

Recently, we launched a product with the following pricing: Free, 500$/m, 1000$/m, Enterprise (more info http://rolepoint.io/price.html)

I read somewhere there is very little software products in range 300$-3000$. It's too expensive to use a credit card, too cheap for enterprise sales. I think it was Joel Spolsky's comment to some article. I can't find it, because probably I'm using an incorrect term.

Can someone provide some resources?