I wish good domains did coast $99--then there wouldn't be so many squatters. I don't think you're providing much value, and I do think you'd make much money at it, but I wouldn't be terribly offended if I found you had registered a domain I wanted. Having recently spent hours and hours trying to find a domain in a very competitive space, $100 sounds just fine compared to $1000's or not available at all. OTOH, I was pretty exhaustive. If you did go for domains in my field, you might not find any worth $100.