I'm fine with them. Part of the reason is that they are participation/content neutral. They can be used for both "good" or "bad" causes. I understand that people think well they're only for the rich and those with money, but I have to ask what about if Unions use them to push for worker related issues? Does that bother people? What if John Stewart had a PAC dedicated to liberal ideas?
I think that OWS people need to understand that they can use these same methods. Why spend thousands of dollars of feeding yourself when sleeping outside when you could actually form a PAC or hire a lobbyist? I also don't want to hear the "oh billionaires and big corporations will drown us", that's just defeatism. If people keep saying oh these millionaires (members of the 1%) wanted to be taxed higher, well how about trying to get them to fund things? How about the fact that left/liberals aren't only broke people. I mean isn't Michael Moore and Russell Simmons one of the 1%? They seem to agree with you. Besides I don't buy the oh the media is controlled example, guess what the internet exists and paid ad space is actually pretty cheap, and there is a ton of avenues for free space for text, audio, video available for free.
Like I said I am fine with them because they are content neutral, people should learn to use them and not just complain about them.