Steve,
'I'd be careful with the doubling up on credits. WGT providesa great game, but they can be pretty nasty when they think something costs them money. They deleted my fiancee's account because they thought I had multiple accounts since we have the same IP address and share the iPad.
I wish they would let us gift used clubs. More people could enjoy the game, and we wouldn't feel like we were getting ripped off getting 25% for stuff we won't use ourselves anymore.
And, it's not like they're not making money on those 'free' credits we spend endless hours accumulating. Probably more than what people spend buying credits. I spent $5 on credits just to get rid of the ads.
I did notice I could use my iPhone too to get credits, but it's not worth the risk of losing everything.