OK, Nigee. As a generally non-gunboater who occasionally gunboats, I would answer some of your thoughts like this.
1) I do this in all kinds of press type games (gb, pp, fp). Sometimes it pays to just take a chance and throw everything at one enemy. You hope for the best and hope Country C sees you focus as an offer to NAP.
2) No answer to this. Sounds like a worthwhile report if you see this common with specific users across multiple games.
3) Could just be good analysis of the moves and deductive play. Again, I would only see this at issue if it was a common pairing across multiple games.
4) 50

is a small buy in. Any buyin a new player could do is a small buy in.
5) I would say this is more of the suspicious nature. But I bet the mods need more than just that to make a determination.
Ouyr site is definitely run more like US Criminal Justice than Civil Justice. The mods run off the "shadow of a doubt" rule than the "preponderance of evidence".