No, workstations and\or graphical stations are powerfull. Gaming rigs can be powerfull, but most of the time they are average or just above average.
Also - steam statistic will show you a great number of PCs that are being used only to play some indie games and\or Dota. 8gb is more than enough for that.
Depends on how you define "power". I'm sure devs often have more RAM for VMs etc, where gamers have more GPU for graphics. I'm building a gaming rig right now, the games I wanna play 8GB of RAM is plenty.