not sure which year you have but I think on one of the versions you had to use coins to buy rounds then beat certain goals like a -12 round, 18 GIR's etc to gain permanent access to the course. I would use coins to buy rounds then play on as easy a level as possible just to beat the goals. Then go back to playing on tour pro level.
Recently went back and got Tiger 12 since i thought that was the best version an one that they suckered me into buying the most DLC courses for. Surprisingly you can still plsy on XBox live w/ friends.
Or if your PC is good enough you can just get
http://thegolfclubgame.com/