Gilbert, even if it turned out there wasn't a market for bagged gravel, you could save up the removed gravel then use it on another job later on.
We did a few yards where we pulled up 20 yards of white rock when I was with my parent's nursery.
I just cleaned it and held onto it, later on we got a job where the client wanted white rock in the beds around the buildings and we resold the salvaged rock.
This increased our
profit margin on that commercial job quite a lot.
If you are in the landscape business, there are lots of avenues for making extra profit from salvaged materials.
For instance, one winter we had a green house heater go down and many 5 gal
trees were hit hard.
I took them and created Bonsai out of them, those sold for 65.00 more than the plant would have sold for if it had not been damaged.