Potions are stronger than available buffs and that's a good thing. There's a very LIMITED amount of potions, so the answer to "who's going to choose berserk as a skill" is a simple "anyone who doesn't want to spend endless hours in the marketplace doing bidwars with people who didn't choose berserk as a skill"
25k for berserk 200 is not exactly a bargain, either, for the masses of players out there.
So, the few hundred highlevel players no longer cast berserk on themselves and they buy it in the AH instead. Maybe they will use the skillpoints elsewhere after the next reset
Oh, and also, what would you want as the new limit? And how would you make sure that it would not result in yet-another-pyramid-scheme which would allow the few hundred on the top to get richer? (That's one of the things that seriously hurt the game all the time.)

