Nope. Look at Steam, for a good example. There are plenty of indie games priced at the ~$10 dollar level, and there are also AAA titles priced at ~$60. Neither one has doomed the other. The games market allows for simpler, low priced indie games, but there is still space for the blockbuster games that cost 5 times as much. They're different products, and different markets.

I don't know enough about Mac software to speak for that though. I'm a Windows/Linux user, and virtually every piece of software I use is free or a corporate application.