Colleagues. I get to meet and work with a bunch of interesting and talented people, without asking them to marry me (which is what many here likens the co-founder experience to).

Also, my employer has a quite significant sales and client management staff. I don't enjoy sales or client management much, and consequently I'm not good at it (or maybe it's the other way around), so I'm happier when other people do that for me.

I might do a start-up one day. But until then, this is a pretty sweet deal.