How many video game apps do you get per gigabyte

well, i am assuming you mean apps like applications for a smartphone. for example a game like temple run (basic front scrolling jump and dodge) takes about 24 MB of memory.
1024 MB in a GB, so 1024/24=42.6
so in 1GB You Can install about 40 large games, give or take a few.

now on the other hand we have paid apps like Minecraft: Pocket Edition. this game requires block id's, scripted code, and other MB eating processes. MCPE will take (this is a Guess) about 30MB or more, GTA3 is about 8.9MB.

Overall you can fit a lot in a GB. id say(previous experience) i can fit about 60-75 game apps into a gb.

so an 8gb ipod is ok for gaming on.