There's one big thing to remember is how they price. it. 1 site is under 40 bucks and I picket up an unlimited for around $150 (I was a very early adopter). Renewing for a year will cost me (if memory serves) 30-40% of the annual cost.

This combined with the fact that it just works and works well make it irresistible. They're a great bunch of people as well.