I kind of both agree and disagree with original poster. Pr. now the company easily gets powerful enough for most of the encounters. More levels would make the company positively overpowered.
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A solution could be to make xp requirement for leveling up exponential. So the first 8-10 levels is fairly easy to reach, just like now, then the subsequent levels will become increasingly harder to reach. That way it will be possible to reach high levels, but those characters will become both rare and valuable. Losing a level 8 character would suck, but loosing a level 15 would really be a tragedy. And that is really cool dimension of the game, to become attached to the characters in your company and follow them as they progress (and die).
