while in the nfl share all their money and have a salary cap they make most of their money from national tv contracts while in baseball its local tv contracts. the differnce is that in the nfl they only have 16 games to broadcast. while in baseball their is 162 games to broadcast. another thing is the nfl has players backups on the teams, while in baseball the backups are in the minor leagues, and if they come up they can exceed the salary cap, forcing the team to either bring a bad player up or keep the injured one on the field. so is sharing a little of the big market money where it will stay.

Baseball has some revenue sharing, but I think its in the form of a luxury tax, and its not nearly enough to produce the kind of economic equity which you have in football, basketball and hockey. A cap/floor arrangement like the NHL has would be the best solution to the problem of haves and have nots(combined perhaps with some better form of revenue sharing), but nothing of the sort would be countenanced by the players association-if the owners ever tried to impose something like this, you'd see the mother of all work stoppages.

No, revenue sharing is not impossible in Baseball, they already do it. A cap is impossible because the greedy players won't let it happen.

Your last point isn't really a big issue. The cap would apply to the 40-man roster (15 of whom are on the DL or in AAA during most of the season), not the 25-man roster. Anyone who isn't on the 40-man roster cannot make major league money, and in order to place a new player on it, someone else must be removed.

As for the point about TV contracts, I guess I still don't see why revenue sharing would be prohibited by the number of games or the nature of the TV contracts. I'm sure the exact nature of the sharing would be different than in football, but surely something could be worked out.

One thing I've always wondered is why the pro sports leagues always couple salary caps with revenue sharing. Why not just institute a salary cap without revenue sharing? Maybe I just don't understand the finer points of sports ownership, but that seems logical to me.