I personally use the 2.5 mill pot and attack 2x per 5 minutes (cause I'm kinda weak) works for me and cuts down on pot costs
I do believe that making more damage doesn't affect much, you still make the same.. So basically youre just wasting money :3
Lul, attack potions increase the damage inflicted, yes. The amount of gold you get per hit is still the same as though if you weren't to use pots, though. WTF did I just say..? lol