In a DRIVING RANGE, there must be a possibility to test balls and clubs for free !! Without earning any credits or points.
If a player likes the stuff, he will buy it, so ...... there is a win-win situation !!
Now you have to rent a club for testing ..... and have a lot of disappointed players who rent (test) a club and lost credits. (see all the different searches on 'Driving range' ... )
Yes, you can practice on a course with the rented driver/club/putter, and use 'mulligan'.
On a driving range, there should be options to change the wind variables (front, side, back incl strength), uphill/downhill, ....and create t the same time 'practice greens', pitching/chipping greens, bunkers, .... .
If WGT wants return ..... let the player see first some 'sponsored' advertising.
It's easy to set up, and as I said, a win-win situation for both WGT and players !!