Then you have the additional jackpot + possible referral earnings
The additional jackpot is evening out anyways in the long term, so it's irrelevant and referral earnings are leeched from people I refer, as far as I got it - so they in the end earn LESS.
If I sign up to one of these pools then, this also means, I earn less - right? So... why the hell would I do this?!
The jackpot evens out, yes. But it adds a bit more excitement, so it's not all just watching the BTC trickle in. It's like a compromise between pooled mining and solo mining. At least that's how I see it. Then you can get referral earnings as well, I earn more than I do at any other pool, and all I had to do was put my referral link in my signature.