I still question why? Coins are about useless. There is no "Golden Putter" awarded to the highest scoring country club when compared to the clashes on PC. Is it just macho thing where " I am better than you "?
If WGT were to put in some sort of exchange rate, say a thousand or even 10,000 coins as equal to one credit, thus allowing the "purchase" of credits with coins, they would certainly build interest. At 10,000 to 1, I would have 58 credits. At least there would be value.