Boy, that's a little of a tough one Francisford.
In OKC you may get a little more for scrap than I do in my remote rural area of AZ, but we are currently getting 240-250/ton (.12 per pound).
Now, if measurements are at least close, then your piece shoud be about 120 lbs per foot or $14.40 per foot at scrap price. But at least he is offering right at scrap price and you are not out driving time (gas, wear and tear, personal time, risk of accident, etc.). And, you get to meet a fellow welder while getting rid of something you don't want and he may be able to use.
Marsh should have paid about $18 per foot for his at scrap price, so he really got a good price.
Not trying to convince you, just offering up my two tin pennies worth. I'd have to ask myself if I was ever really going to need it or wanted it sitting around. Scrap may go down and then you wouldn't even get that much.
Have a Great Day, Brent