Probably because of their retarded late-fees. I hate both Blockbuster and Netflix. The owners are die-hard leftists.
Blockbuster is a little more even in their politcal donations. I used Netflix for about a year. Did a 2 week trial of Blockbuster, but their deliveries were slow. A few months later, tried Blockbuster again, and deliveries were on par with Netflix. So I dumped Netflix, and have never looked back. Blockbuster has been great!!