Seriously, there must be a market for these or the RMT would not bother.
Are sky linkshells really buying these? Or desperate Nin's without shells? Or Nin's with shells who hope everyone believes they went camping U with a couple of friends and won the lot?
I've long been under the impression that no respectable LS would buy stones, but that doesn't explain the market for these things.
Is it normal? Is it some linkshell's dirty little secret? Is it shunned or just BAU for some shells?