arguably it's better to trade money for junk than to trade it for nothing at all.
Like I'm pretty sure it shouldn't set off a flag if they even have a system in place when you have atleast something on both sides of the trade.
I think flags would just be triggered by an unbalance in a trade, so a tinderbox wouldn't really change anything.
No real evidence backing that up though
RWT bans are very rare now anyway so I wouldn't worry
no one has gotten banned for rwt THAT i heard of so i really wouldnt worry bout it. though if i had to choose i would say staking as addding tinderbox is nothing.