Why is it that pokerstars is such a popular site for online players?

[ThE_DrOpOuT]

For the everyday grinder they offer no rakeback promotion, and only at the highest vip levels do they offer nice perks. I understand the high volume of players makes the site very attractive to people who want to multi-table, but it seems like these players are missing out on very lucrative rakeback deals. Could somebody please fill me in if im overlooking some details of the vip packages at pokerstars, thanks.