I realise this thread is pretty old and the board gets less traffic than a streetwalker out on xmas eve, but here's my $0.02 anyway.
Base stats for a starting merc average around 20, right? A 50% max increase (i.e. half) equals 30. At each levelup since you get a .33 increase, for 20 that means 6.6 and 30 gets 9.9 (let's be generous and round them up to 7 and 10 respectively). Level 50 is 49 levelups from 1, so a base stat of 20 would get 343 points while a maxed 30 stat gets 490. A little over a 40% increase or so. That... isn't really all that much.
Well yeah every little bit helps and all that, I guess I've been spoiled by SRPGs like Disgaea, where base stat increases from transmigration can go up multiple times the original base, instead of being capped at half of it. I've really enjoyed TTT but the battle system is only a glimpse of how much further it could be developed.
Edit: I just compared a merc I put "through the paces" (gotten all skills, leveled with the muffler on), with an earlier merc with whom I just mucked around different jobs to check things out. Stat-wise there's not too much difference; the souped-up guy did have better stats but not by much, I'd say not even 20% better. Level difference still counted for more.
To repeat what someone posted earlier, just do the following to get all skills on a merc:
- male : Hunter(20), Soldier(22), Druid(50), Knight(50), Minstrel(50)
- female: Archer(20), Fencer(22), Paladin(20), Seer(50), Musician(50)
Takes only 1 battle to hit the 20s in postgame, and not that many more to hit 50. Wear the muffler if it'll make you happy. Then park the merc in the final class you've decided for it and get rid of the muffler. I like shoes, the movement rate in this game is annoyingly slow.