Ellie and Sam helped me plant loads of broad beans on the allotment last weekend. I like broad beans. They'll be one of the first crops we can eat next spring, but we've planted far more than we'll ever eat.
It doesn't matter, though. I had packets and packets of seeds that people had given me, so it costs nothing. And the land will be unoccupied over winter anyway. It's better that there's something growing on it rather than just leaving it bare for weeds to colonise, or for the soil to erode. The bean plants will add nitrogen to the soil, so the ground will be great for brassicas and other hungry crops next year.
I might be able to barter my surplus beans at the farm shop. But even if I just dig it back into the soil - basically use it as a green manure - it's a worthwhile thing to do.