Got 4 surveys yesterday through Peanut Labs for a total of 504 credits. I happened to fit a demographic that they were looking for.
A long time ago when I wasn't sure I was going to keep playing I just spent my credits on 7 dozen balls. Not playing many rounds, I still have quite a few left but I'm not really interested in upgrading them for the way I play this game. I'll just keep banking the credits so I can upgrade the clubs when I finally get to a level/tier that justifies it.
Thank you, WGT, for at least giving us the opportunity to gain credits through the surveys and views.