Let's say I have two accounts, I use the 1st account to watch the items of the 2nd one. Would that cause linkage? When newly listed items are added to watching lists, they get pumped up in the search results immediately.
What do you think?
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I would do the "watching" over a few stealth accounts if I were to do this. But I wouldn't do it. The tiny perceived boost in listing rank would not be worth the possible risk created by tying accounts together by watching your own listings.
I seriously doubt you would get your accounts linked. I just don't think it would be worth the trouble.