Endless levels are not cool, the game should have an end, but better infinite levels than starting over every time to reinforce.
well you still work hard to get those levels, every level after 99 costs the same but with a bit more, which is 150000 EXP i think? you cant get that much easily without quests or some tricks, Altho you reach some point where you cant upgrade anymore... i think its around 500+ where you cant spend your points where cuz everything is maxed.
this... is where Endless traits mod come in, lol