I used to make paid games without ads & iap (but earned almost nothing because my games are too simple, and people don't want to pay for them -- that's reasonable)
But recently, I've thought about making free games without ads & iap (basically games like the good old time), because I have a full time job and don't really need much money; and if my games go viral, I may find other way to monetize (ask for donation?). But I've pretty busy & lazy lately :(
Now I think I should not postpone anymore, starting by making current games free. You can check them here: https://play.google.com/store/apps/dev?id=5502853966731586888