It does cost some to get new discs but I've found a lot of discs too so it evens out. For a sport the equipment cost is not that much, it is just the fact that you get really attached to discs that you have thrown a lot.
The Raspberry Pi has been a fun project. I'm hopeful to get a bunch more things working on it but we will need to see, at least at this point it makes a good server for my music, pictures and video. They are such low cost, low power computing devices that if I can get things working on them I could easily do a bunch of network servers.