Pecan is a hickory, if that helps on the firewood question. It's not quite as good as shagbark; more along the lines of bitternut (which ain't shabby). I've never cooked with pecan but imagine it's top-notch for that. Ten bucks for a wheelbarrowfull that size is quite fair (more so if fully dried) for a residential area like that, especially mixed with a good oak. It looks like it'd be about one-thirty or one-forty a cord that way.
The whole pecan pile looks to be about as much wood as I got from a pecan I removed about a month ago. It was evidently never comfortable with it's location and the grain was about as twisted as elm. Too bad it was a dual stem tree and shaped the way it was; we'd rather have dropped some on the woodmizer than split it all.
Glen