The thing to remember is that if the spots facility was to stop, somebody will start another spotting service. Spotting is now a standard part of the majority of hams operating, not just SOTA hams either. People still have radios on monitoring and people still sit in shacks playing radio. But spotting allows people to go and do other things and watch spots. Then when that ZD8 activation is spotted, you can stop gardening, decorating or whatever, join the massive dog fight of a pileup, work the summit and go back to whatever you were doing. Spotting allows you to still be active on the air but not devote 100% of your time to that.
The genie is out of the bottle and will not be going back in ever. We have to live with the fact that operating has permanently changed.
With that fact in mind, if I carry my gear up a hill and lose some sweat in the process then I want to work as many chasers as I can in the time I can spend on the summit. My reward is not the points or the uniques or the completes though I thoroughly enjoy collecting them. My reward is working as many chasers as possible. I get to be the DX with my own pile of people trying hard for a contact with a GM station. Hell, we're so common on the air, nobody would give me a second glance. But when I am on a summit, then to chasers I'm special and spotting lets me tell the chasers I'm on a summit and on the air.