Why buying a company if you don’t want to make any change? Investment firms make profits by buying low and selling high, and it is hard to sell higher than the purchase price if things are kept the way it is.
Maybe they wanted the cash in hand rather than a high variance company valuation. Or just wanted to transition their money and attention to something else. There are plenty of reasons to want to sell a company in a way that both sides come out ahead.
Also keep in mind that the public SO doesn't even have to change much for there to be "big changes". SO Jobs is where the money is made and they have private Q&A sites for businesses.
Or you can pump it, promise lots of new technology and "synergies" and profits and then dump it for a huge sum to VC or Big 10 company while it's still promising but you're pretty sure it's time to dump.
Why buying a company if you don’t want to make any change? Investment firms make profits by buying low and selling high, and it is hard to sell higher than the purchase price if things are kept the way it is.