soooooo true!
Many years back when my FLGS was pushing SOTR (good times) the shop owner gave us a mini campaign of games and one needed 20 zombies to hunt and kill as part of the scenario, as you killed the zommers you wrote down the numbers you'ld killed and at the end of the game we rolled a D20 with the number that coincided with one players zombie kills being the body which had the secret plans (or whatever) and they then got extra VP for it
we upscaled it so we had 50 zommers...which meant percentile dice and halving the result to get the lucky zombie.....and then inevitably we decided why half a percentile dice result when you could just have 100 zombies.....hence the fact my horde built up to 10 zommers (and never really stopped, current count would be about 150 i think)
As you say....you can never have too many zombies