herones replenish

[saz977]

Hi all

I just want to check something, j always play 2 players,. So one player controls 4 heroes. With heroes replenish is there a max number or can you just burn through them all? I hAve just played a scenario where 7 heroes were taken out, and the more expansions you have the more heroes. It seems little unfair that potentially you could just go through 10 + heroes in one game.
If this is the case do you allow it or house rule to a certain number?
We played zombie apocalypse and towards the end I was just throwing the heroes in harms way just to win, knowing I would get another.

Thanks