To help offset the cost of rising server prices, NS should implement some sort of commission for any sales that are made on NS. Say you post a pair of skis, sell them to some schmuck, you should either a. make a donation or b. give a certain percentage of your sale to Harvey/NS. I think something like 3% of a sale is a reasonable amount to give.
Just a thought, would help with server costs and what not. It would basically be close to impossible to enforce, but definately something worth considering in my opinion.