Not only do you pay for the used kegs, but need a good cleaning and some parts. I've bought those "reconditioned" kegs before and they always tend to need something. I'd rather buy new and not worry about any of it at these prices. I miss the buy 10 for $300 deal I got originally. I have 14 now and would like 20. Everyone likes even numbers, right?
Used is fine, new at these prices just makes sense.