After suggesting it was time for Craig Newmark to finally cash in on Craigslist, he responded to the idea with a "not interested". I've got to give him credit for staying with the cause at a time when Web 2.0 has created the perfect financial storm for many Internet entrepreneurs. That said, one thing I've always wondering about successful entrepreneurs who enjoy running their companies is what they do next after selling out - and whether it can ever be as much fun. It's like one of my four rules to live - "Never leave a good time (i.e. a party) before the next place you end up going is never as much fun". For Newmark, can anything be more rewarding than Craigslist? Probably not. The same likely goes for RIM co-CEO Jim Balsillie, who's having the time of his life running the world's best mobile e-mail company. If RIM did sell out for billions of dollars, Balsillie would be rich beyond his wildest dreams but then what? True entrepreneurs would like Jim Clarke would do it all over again because starting new companies is more of a rush than actually running them. For most of us, however, we're lucky to have jobs we like doing - let alone jobs we like doing where we also own the company. So carry on, Craig. If you have no interest in selling, you may want to at least think about giving yourself a raise and some walking around money.