It's very borderline. This is of course my personal opinion...
WTB btc with fiat or alts - bitcoin marketplace
WTB btc with alts = selling alts - altcoin marketplace
Maybe I see it differently but this makes the most sense to me
I'm going to underline this, to see if I'm the only one confused here. I don't really see a difference, to be honest. Maybe the wording? If I say I'm selling for bitcoin it will be moved, but if I say I want to buy bitcoin with the alt it won't?
Just selling altcoins for BTC, fiat or any other coin doesn't belong in Currency Exchange. The quoted rule is referring to threads that offer exchanges between fiat and BTC in addition to other exchanges (e.g. BTC to alts, alts to fiat, etc.).
I maybe be a bit dense today, but I don't understand what you are trying to say (sorry). If the currency exchange board is not meant for just exchanging coin A for coin B (being A or B Bitcoin), what is it for?
On top of that, moving serious threads that may get a chance to be seen in the bitcoin marketplace board are doomed the moment they go down to altcoin marketplace, but that is only a personal appreciation