Well, I guess it's a personal thing. Good luck with your campaign, hope to join you, when my campaign colapse.
These type of schemes only last 2 to 3 months anyways. Last one, was 600 days.
For me it's just nice, getting paid for a chance. Before that, I got ripped off by 2 signature campaigns, and lost 6 weeks of good constructive posting.
Cryptominer is a scam and you chose to promote it. Yes, they may be paying you well, but they're hoping your signature will drive some suckers to their site and they'll rip them off for more than they paid you.
I wouldn't feel OK promoting them. There's a difference between earning in sig campagn and being total signature whore.
So yes, I guess you're right - it's a personal thing.