You should probably just make this is a poll though
Added
You understand that this is language (or culture) -dependent more than it is currency-dependent right? In english "10$" is always wrong (or at least not the preferred form) but in many other languages that would be fine and putting the symbol before the value would look just weird. The same thing will happen to
BTC.
This poll is basically asking "where does your native language put the currency symbol".
Poll results will be skewed though, because probably most people here come from the US, where you place the dollar sign before the amount

.
The same is true for euros and pounds so that covers most of the other people here

Er, no. My own guess is that in the native language of most EU citizens, the comes after the value.