In the old days we'd get bug fixes and a few levels thrown in with a patch.
Times, they are a-changing.
I suppose it just comes down to, 'if you don't like it, don't buy it'. Who cares? I don't.
If someone makes some 'DLC' for a game that I really want, I guess I'll buy it. I haven't seen anything yet though.
Then again, I'm not sure that I've bought a game that actually offers patches and upgrades for a fee.