So ... do I understand correct: it's not about VAT on the Bitcoin-Purchase (1000€ + 200€ VAT) but about VAT on the fee (10€ + 2€)? If this is it, it seems not a subjects of legal discussion that everyone who earns money with a service has to pay VAT on his income.

Edit: In germany it seems we have a discussion about (c), if you buy/sell bitcoins as a business. That is very problematic.