I'd never consider it if just starting out and needing to fill jars. But w/ a good stash in the cupboard, I'm thinking more along the lines of next to no maintenance compared to 4 week veggers.
I think of this in kinda similar manner as yourself but I think it would be decent if needing a quick crop to come in. I have done it a couple tikes and have always been pleased woth the results. Especially since I do not grow any beans I actually wanna grow this method, but I like you have a decent amount of last resort beans to get rid of. So if I can pop it in the ground, give it minimal attention and figure out from that little grow if it is something I should order or forget about that works for me. Plus I have a lot of nirvana fems that I ordered when first growing and would like to get my money back out of those. I will be starting a 12/12 fs grow next month to use some of said nirvana beana up.
In other news, 9/10 on the red eye jedi. They are in 2 gal containers for 3 nore weeks. Also cleaned up some more of the lower branches on the blueberry hashplant and added 2 rw-75 area 51 leds oto add some light to the corners. Will have an update tonight or tomorrow, will upfate my bbay thread to sinve it has been a while and finally getting into flower which is always more interesting than veg.