If you've already got the decent Sheffield version why sell it and buy the cheaper copy?
Yeah, I know the Sheffield will sell for more and then you can buy the cheap one, but how much up will you be on the deal? Not that much. Not an amount to make it worthwhile.
Enough to buy a chip supper?
I say keep the Sheffield one and use that. Every time you take it out you'll have the satisfaction of knowing it's a decent tool and give you pleasure to use. That alone will pay dividends, far more than the measly profit you'll make by selling and buying a cheap copy.
You've already got the tool, and a decent one at that. Keep it and use it.