There are many sites accepting credit cards to buy Bitcoin, but they charges a huge fee, sometimes is more than 10% (and I think never less than 5%).
Why is that? what is the problem with buying Bitcoin with CC? because usually buying via bank transfer has no extra cost.
I think could be related to some chargeback protection, but if this is the case, is not possible for example to block the "withdraw" of BTC from the seller account for a few days (or whatever is safe to avoid chargebacks)?
Sorry if it's duplicate but I couldn't find the answer neiter here nor google :(