It's common courtesy to sell stuff, especially used one (even only a little bit), at a lower price than you paid. For instance, recently I sold a pair of jvc fx1x, which I used for a couple of days for 15 bucks to a noob even though it costs 35-40 bucks where I live. I also sold my pair of vsonic GR02 BE for 26 bucks even though I've used it for two week and I bought it for 36 - hell, I even included a pair of shure olives. If I was selling my c3 I would probably ask for 90 bucks tops even though it is as new and I haven't put anything on the internal memory and it hasn't been formatted, so it still has all the included songs. You just shouldn't sell used stuff at a huge profit just because the local retailers are selling it like that - they're paying taxes, shipping, web hosting (if it's an online store), rents and more taxes if they also own a real store etc. So, when you open you own store and pay all of these you can sell overpriced stuff to get a profit but trying to take advantage of some noobs online isn't right even though I doubt someone will pay that.