Not long ago in the Silicon Valley, winning nearly $200 million for a fledgling company would have earned universal acclaim. In the tech world, selling out wasn't a gibe; it was the whole point. But now, as the acquisitions market once again heats up after a prolonged downturn, instant giddiness over the prospect of getting bought out may be fading. Yet the history of small Internet companies being snapped up by large ones isn't pretty. The great expectations in the wedding announcements tend to fizzle under the daily reality of life in a corporate bureaucracy. Engineers find themselves with less leeway to experiment than they enjoyed during the startup days; product development slows to a crawl. Frustrated, the startup's founders -- having fulfilled their obligation -- check out.