Everybody considers them expensive, unsafe and just plain evil. You pay with money you have and you pay a fixed price per month for the service -- no transaction costs.
If you want to sell stuff to the world, please support payment gateways that are not evil and as insecure as, well .. a credit card, would actually be the example.
Companies smart enough to allow people in nothern-europe to actually pay: Valve, Apple. Companies dumb enough not to: EA, Google. Who is selling online and who is not?
Newsflash: If your sales numbers are less in Northern-Europe than they are in the US, it's because you are either actively blocking those customers (region-locks or refusal to ship) or you are not accepting n-european payment gateways.
Credit cards are the equivelant of saying 'i only want american customers and everybody else can go to hell'. Let's just hope your bussiness is viable enough in just the US to be this ignorant.