does someone know, if its "allowed" to use?
If not, there will be Ƀ the next favorite
And the $ is used only in the USA...
The general dollar sign $ is used in so many common situations and countries that people dealing with international transactions would by habit verify which currency is it referring to. However, using a symbol currently only used by a specific currency would create a potential for errors if not outright frauds. Just imagine if you had a contract for ฿100.00 thinking it was 100 bitcoin but the other person pays you 100 baht instead.
That's a good point.
This is yet another case of the bitcoin community being it's own worst enemy.
A complete disregard for standards and existing systems is not going to give bitcoin plausability with merchants.
We need integration with other economies.
While I see much potential for bitcoin, and believe it may ultimately become a widespread and useful system - It's by no means obvious that the timeframe for that is necessarily short.
What if it's 50+ years before it 'takes off'?
The way the general public and business perceive bitcoins could well keep it on a hobby scale for decades, even though the underlying technology and potential are fantastic.