I play on kindle exclusively as my motherboards pci slots went on my PC.
From what I can gather you don't need an average to go up tiers, untill you want to get to master, I went to tour pro at level 50 with a 74 average (it should be 72) so a tour pro can have a 150 average, with just playing the coin rooms. To get to master I believe you have to have the 67 average.
I play all the county comps I can, which is about 10 a week, I probably play more than most on PC, if my tier isn't high enough it will say inelligable and im guessing if I can't play a course, it just won't show me the competition.
I very rarely play the coin rooms, I don't need the coins for anything with playing on android, but when I do there are some very good and very bad (like I was not too long ago) members who I have tried to help out, 1 didn't have a driver, another had no wedges, so told them how to equip them.
Don't right all of us mobile players off, we are not all teenagers who have an attention span of a knat and just want a quick fix of COD. Some of us want to play and get better, but have to play on mobile due to unforeseen circumstances.