This only works on WGT mobile, so if you are using a different system this post is pretty useless.
If you own a tablet and a smartphone install Wgt on all mobile devices you have. Start the app on all devices and go to earn free credits. Play the credit reward videos on all of them at the same time. Let's say there is a 15 sec video and you have two devices that means 16 credits a minute. So you can get to nearly 1000 credits an hour.
When it says "no more videos on offer" ignore it and keep going. 99% of the time it has new videos anyway.
i usually do this when I make dinner or watch tv. I can now peel a potato in under 15 seconds;-)
And then there are the surveys. Don't do them on your iOS devices because you'll get scammed.
but if you go to the surveys on the Wgt website you'll see that they usually work. But you can get disqualified. If you get disqualified you'll earn 5 credits, when going the Free Way everything counts;-)
This way it takes me a few days to buy a set of 3000 credit clubs. It takes a bit of effort but I rather do this then spend lots of money on virtual ***.
good luck!