Here's the deal:
You build value in a startup. A company comes along and sees that value, decides it's worth some cash to advance some internal mission. Company offers you something that feels like a good deal.
Boom: sold. Right?
Who better than the people who built the company can judge the quality of these offers?
Moreover, let's say stodgy old company absorbs an awesome startup and puts their tech forever in the basement (a la Nokia here, or Microsoft with Danger). So what? It's not as though these bright minded founders simply evaporate into the atmosphere, forever lost to the future of human civilization. Now these guys are smarter, more experienced, and hopefully even better capitalized than when they started. If they're truly so bright, off to build a new idea they will go.
And if not, no big deal either, the world got what it could from them. Who's to say their idea/technology isn't in better hands now, held by a company with perhaps steadier revenues or a more mature infrastructure for distributing or selling the product?
There's value in independence. There's value in seeing things through with the long view. Absolutely no disagreement there.
But as long as you're not running an elaborate scam, how you make your money, who acquires your company and what they do with it afterward is none of my business. I hope you got a great deal and that you're in great shape for your next stab at the next big thing. (edit: if you end up making a dominant yet shitty product, though, I reserve the right to pine for the next big disruption.)