Yeah, we tend to spend money on things that we later find are not as useful as they seemed when we were fingering them on the shelves or looking at them online. I've tried them all. Sidesaddles, buttstock holders, slings, you name it, I've tried it.
After three decades of carrying a cruiser shotgun, I'm down to an elastic buttstock holder with ammo in it, and I've never really needed the ammo I carry there, but I'm more comfortable with those extra five rounds. My hunting shotgun is devoid of ammo holders. When I'm hunting with a shotgun, I wear a standard hunting vest with a box of ammo distributed loose in the pockets.
Handguns are even worse. You should see my holster drawer. It's filled with things that seemed like a good idea at the time.