Steve915: I think I play ok, though I'll probably never be a top flight player...but I attribute that more to my stubborness with playing the free balls.(I got tired of WGT taking paid for balls "out of play.")
Since others have already addressed your primary question, I'm going to add my 2 cents here.
Purchased balls have a set number of hits to them. Everybody should know that. So, I'm not sure what there is to be "tired" about. Additionally, since you live in the US, it's pretty easy to earn free credits. If you don't want to do the surveys, just load the app on your phone and watch videos
while doing other things.
The cost in terms of time is minimal (if any at all), and a person can easily earn over 100 credits per day through watching videos. Unless a person is playing a lot of rounds per day, that's enough to purchase balls without having to spend one's own money.
And throw in a survey here and there, and it's fairly easy to build up a bank of credits (
if the person lives n the US; outside of the US, it's definitely a YMMV situation).