One of the things I like most about the Suikoden series and Chrono Cross is that there is no so-called "insanity factor." It's impossible to level up beyond a certain point in Suikoden because monsters stop giving experience to your players after they pass a certain level (it varies per monster, obviously). In Chrono Cross, there's no actual experience system; you gain levels each time you successfully defeat a boss. Allowing a player to level up insanely takes most of the challenge out of playing an RPG; you don't have to formulate a strategy, you can just plow right through by power-leveling your characters to insanity.
Of course there's no artificially imposed limit when you're exercising, but doing the same exercises over and over, after awhile, isn't going to make you stronger; it's just going to keep you at the same strength. Similarly, fighting the same monsters over and over shouldn't make you a better fighter after you pass a certain point, but nonetheless, in Final Fantasy VI you can nonetheless go to Dino Forest and whack out as many dinosaurs as you want and you'll eventually end up with superhuman strength. (Of course, you could argue that you'd need superhuman strength to defeat a bunch of dinosaurs with just a sword, but I still can't imagine it being as superhuman as the person who controls all magic in the world, yet that's exactly the way it goes in FFVI).
I distinctly remember the Atma Weapon doing well over 4,999 damage per hit with Offering at level 50. It's been awhile since I played, though, so I can't give you exact specifics.