how come low elo never gank mid?

yeah id say theres a lot more to be gained by ganking bot successfully but i still look for stuff mid if its there like if they play lux or annie or veigar etc If its like fizz liss lb etc i try to see if they will waste their escape to farm then go in i kind of expect my mid laner to be ganking about 50-75% as much as me too tho so maybe no ones home sometimes hehe

Probably because mid is one of the safest lanes now due to people rarely picking immobile mages and just going with safe picks/stuff that's hard to lock down.

You rarely ever see anyone going veigar, orianna, or heimerdinger now. I mean why would they? those champions are left in the dust while mobile/safe shit like malzahar, zed, azir, yasuo, lissandra, leblanc, fizz, etc exist and all those champions have mobility or safety in one way or another.

Why gank a lane with a champion that can with one press of a button avoid your gank completely when you can use that time you used on mid to gank a lane that is more likely to get the kill.

play jungle more often.

Ganking can be hard when the opponent is hiding under his tower due to constant poke and insane pushing from my midlaner