I like the concept of having a proper Trademark (legally speaking : serving to identify the source of goods/service, with secondary meaning, widely interpreted/known by the public as one precise good/service)
Yet I disagree on copying the design of a regular gold-ish coin. If we create a new currency, why keep the old meaning of a coin (especially a virtual one). I feel the same way when a new website/service appears with old symbol for mail (the simple letter) or search (the looking glass). Let's do something new !
As for the Baht debate, is the national Thaïland currency symbol different (simple straight vertical line in middle of the B, cf Wikipedia) ?