Of course. They're cheaper. Consumers love cheaper goods. Personally, I'm very much in favor of GMOs and think it's a shame that so many countries overregulate them so much. There's no evidence of that the crops themselves have caused any harm whatsoever to human health or the environment. Now, may not be the case for the chemical pesticides and herbicides often used with them, but that just means we should regulate those chemicals.
Given a choice of organic vs GM I never heard anyone preferring GM so far. To me it seems all these benefits are somehow always for others to capture.
Yes... The market encourages it.
How else do you get inexpensive, pretty, fresh, tasty food so easily in supermarkets?