Fair enough, but having been through the boom and bust of the late 90s, exposure to startups can also be overrated.
Yes, the upside potential can be huge, and you get to play with some bleeding edge technology, but you're also dealing with a lot of inexperienced owners/managers, VC's with their own agendas, overworked employees, and an unhealthy amount of greed.
Yes, there are startups that manage to avoid this, but like in any industry, good companies are the exception rather than the rule.
A good thread:
http://news.ycombinator.com/item?id=3814407