The great thing about a big jackpot is this:
I'm currently last in line, at #9, a 2 BTC bet. In most rounds, I'd be worrying "Oh, no, what if no one else joins! I'll lose 2BTC!" but in this round, if no one else joins, I'll get the jackpot, currently at 2.55 (I'm not last anymore).
So, what if 1 more person gets in line behind me (just happened). Then, if no one else gets in, he'll get the jackpot and then I will lose my 2 BTC.
If it comes down to that, I'll get in again at the 1 BTC min to try to win the jackpot. But it won't because someone else will get in to try to win the jackpot.
As Bitcat.ch round #4 taught us, a big jackpot - a forever game. (Bitcat.ch round for has been running for several weeks)
It will slow down at some point, but the 1.15x low payout will help keep it going. And while it will eventually slow, it won't stop. The jackpot will keep getting bigger and more tempting, and the Bitcoin Conference this weekend will bring in a lot a noobs looking to spend their shiny new BTC on something.