After the Scrypt ASICs will hit the market there will be tons of cheap used GPUs. It would be nice to exploit this by making a site where you can exchange or buy these GPUs for GPUcoin.
That's actually a brilliant idea. Trading in your old gpu's for gpuc. It would act as a store credit if you wanted to upgrade or just go on the market and trade for btc.
I don't personally don't plan on dumping my gpu's. BTC at one time was mined with gpu's then the asic's came and they moved to LTC....now the asic's are coming for scrypt and the move to -n begins.