1st - I can't say from my very own experience, but our partner is launching a co brand of our website in Hybri, so we'll see.
Friends of mine from Israel actually mentioned 90 pct. of porn purchases from Israel happens through Arabs.
2nd
Germany is a two edge market - they more or less have money, they more or less are able to pay, but they are also never satisfied and you need to offer them a lot to retain them, it's extremely suitable to have Webbilling, Click n Buy, Sofortuberweisung in place to name a few totally German suited payment options.
Germans like to pay with something they already have a good experience with, as they are extremely suspicious.
Italy does wonders for us - Italians are crazy about porn, it's 60 mil. market and even their language skills are usually extremely poor and you need to have everything in Italian, it's well worth it.
Any country from the civilized Western Europe - Benelux, Scandinavia, UK is great traffic, UK is killing it if you have amateur stuff in place.
Spain and France - serious language problem, never seen that much traffic from those markets, but they just don't perform that well as other western Euro countries.
I probably wouldn't bother with any place eastern from German borders, as the traffic costs probably more than what it earns.
The only way to go there, is to try to setup something like a license deal with someone who has a lot of local traffic, selling your content using sms payments / clip downloads,
BUT:
a) most likely getting fucked over
b) even this is not too financially attractive, as it's so much free porn on the net, and these people never pay if they can find a way how not to