Berlin DOES matter. From posts on TRBY board, I've learned that the scum doing "naked shorting" of BB stocks have found a loophole in the new rule prohibiting "naked shorting". "naked shorting" is shorting a stock even if no shares are available for borrowing, essentially allowing someone to short an unlimited number of shares. That is bad for us longs!
If a stock is traded on multiple exchanges, "naked shorting" is apparently allowed, to facilitate arbitrage (profiting from differences in price between the two exchanges). So, TRBY has learned that shorters are FORGING applications to the Berlin exchange, getting stocks listed on that exchange without the knowledge of the company(s). They pretend to be the company, and apply to have their stock listed there. Once listed, they can use the loophole to do "naked shorting".
The fact that there is zero volume does not mean it has no affect on the US OTC-BB price - the mere fact that it is listed on 2 exchanges allows "naked shorting", which hurts our USA price.
Read the recent PR from TRBY, discussing what they plan to do about it, and the related discussion on IHUB's TRBY board.
This is all from memory, and I'm no expert - but it makes sense to me.