Personally, I am just about okay with it. Have you considered inserting 'c' of (B)it(c)oin instead of the horizontal bar (dash) on the alphabet B?
Even if ฿ is the symbol of Thai currency it could be used for Bitcoin too. Much will depend on the context and besides not many buy online goods in Thai currency. US $ is the de facto currency in most places.
Also a small, really small, horizontal dash on the second leg of B isn't as great as horizontal dashes of £, €, ¥ no?
Have you considered a slant cutting across B? Or the mathematical/Greek beta sign (U+03D0) or its derivatives [1]?
Is not the same as purchasing goods online from foreign websites. Purchasing using Bitcoin is but only one use-case.
Besides I have not many (not one, in fact) Thai portals listing its prices in any currency other than US$. Not one.
May be there could be some selling incense sticks in local Thai Baht, but meh that's not meant for 65 MM Thais. However, it may not be a great idea to adopt this symbol because, like you, many Thais would want their currency symbol to remain unique.
So when Thai people want to buy something online, how do they know if the price is in Bitcoin or Baht ?
Your attitude appears to be very US-centric: you don't think Thai people buy things online in their own currency or you don't think it's important if Thai people never use Bitcoin ever.
Just because some online stores have detected your IP address originates in the US and shows prices in US$ doesn't mean they don't show THB to Thai IP addresses.
My only concern is that for the sake of choosing an appropriate symbol in the beginning, you are happy to make people suffer confusion.
Even if ฿ is the symbol of Thai currency it could be used for Bitcoin too. Much will depend on the context and besides not many buy online goods in Thai currency. US $ is the de facto currency in most places.
Also a small, really small, horizontal dash on the second leg of B isn't as great as horizontal dashes of £, €, ¥ no?
Have you considered a slant cutting across B? Or the mathematical/Greek beta sign (U+03D0) or its derivatives [1]?
[1] http://en.wikipedia.org/wiki/Beta