Leadership bug?
 

Leveling up to level 51, my warrior received only 500 leadership. Shouldn't it be 1020, since level 50 gave me 1000 leadership? Is this a bug or is it supposed to happen?

Its not bug. After 50 you are getting half of runes and leadership from lvl 50 .. its just like lvl 50 is max actualy

Ah, I see, thanks. What level do folks usually reach if every quest is completed?

Well, with all the quests completed and all troops killed, that should amount to lvl 51-52. If you took learning early and used some other XP boosting items, you can get to about 57. In my last game as a mage I actually found 2 +10% XP gloves, but the second one was really late in the game, and it spawned after I killed K'Tahu, so... 57 is tops in my opinion. If you can get 2 necro gloves, the shark tooth (guaranteed) and the marshal's memoirs, that's 30% xp per battle. Learning gives another 20%, so that's 50% per battle. That should push you into the 58th, probably 59th level, but getting all those in the beginning of the game is highly unlikely.

i was 57 also in my last game. had memoirs and one gloves of necropolis or whatever it was called