You want me to work for you for free so I get "invaluable experience"? How much is my work worth to you, if you're not paying me? For that matter, how much is the experience I get, if I'm doing worthless work? You want ME to be grateful for the privilege of getting the experience of making YOU money for nothing in return? Screw YOU.
Mark Cuban makes it sound like this is about the bright-eyed ambitious kid who just wants to get his foot in the door and, given that one chance, will eventually rise up to run the company. Bullshit. The ambitious kid will find a way. This isn't about him.
This is about all the people struggling on the lowest rungs of a profession, trying to enter it. They can't find a job, so they'll jump at any chance they can to be "working" in their chosen field, even if they don't get paid. They're strung along with the promise of an actual job down the road. And guess what? As soon as they want money, they're out, replaced by someone else who's willing to work for free. This is about having too much supply and not enough demand for a profession, and free labor only makes the problem worse, by masking the real market condition.
This is about a lot of things. It's about ambitious kids, it's about struggling people, it's about flux in employment conditions. You can bring in mentions of the apprenticeship model of yore, but you'll probably realize pretty quickly that there are some big differences.
But let's drop that bullshit and call it what it is, Mark. You're arguing against minimum wage, since zero is usually less than the minimum wage. Why don't you come up and make that argument straight up.
Edit: after re-reading my comment and noticing how many comments there are here and on his blog, I once again realize that Mark Cuban is a troll. Bleh.