The only argument against using ฿ is that it is used for THB aleady.  On the other hand $ is already used for USD, CAD, AUD and NZD.  While ¥ is used for Yen and Yuan.  Currencies sharing symbols is nothing new, that's why we have three letter codes for them as well.

Ok, so now I know why it looks shitty on my and many other systems. The vertical strokes are in different places depending on the program I use. In my chromium browser they are too far right and in gedit they are in addition to far right too short.
Knowing it is actually a double-symbol makes me all the more favor any of the single-symbols that at least should look consistent on all systems that manage to display something:
฿ or Ƀ.

The $ symbol being used for many many currencies should be reason enough to not have a problem recycling the Baht symbol for Bitcoin. Here in Chile they also use $ for Chilean Pesos.

Depends on how long "most people" use broken stuff. It works in all the software I run, at least, excepting only Links.

Seems to work fine. I just copied a BTC from my broswer into an ANSI encoded text document and it autoresolved to "BTC".

If they don't, it's a bug.

B⃦ is standard UTF-8, it is not UTF-16.

I'm not addressing whether baht is an acceptable replacement or not; just the reality that it isn't the current standard BTC symbol.

My system supports Unicode 5.0 or 5.1 with UTF-8 and all my programs are configured to use UTF-8, I can assure you your pet favourite isn't displaying properly.

I made a test page for the BTC symbol in Unicode since this forum forces a non-Unicode encoding.

what OS and browser?