Here in upstate NY, aluminum scrap is about $.55/lb. Figure there is about 300 to 400 lbs of aluminum in the boat, so maybe $250 at the most.
Same prices that are around here. Plus they make you cut the boat up into smaller pieces that are manageable by hand and can fit onto their scale for aluminum. Cutting one up is alot of hard exhausting loud work. So by the time you figure in your labor of gutting the hull to just the aluminum (not one piece of steel and wood or you get price docked to 25 cents a pound), you basically break even depending on what you think your labor is worth.
So, most the ones that claim that are b.s.ing or have not looked into the requirements to scrap one. Another option for one of the yards here is to simply take the whole thing across the scale like a car for $60 a ton. Not very good price for light weight aluminum hull.
The few guys that I have seen actually scrap one out was laid off (labor value low), got the boat for free and sold the trailer on craigslist afterwards. They came out better on the trailer that the aluminum.
Don't worry, the boat was a lone star, not a Starcraft.