Extras yes or no, depends who.
Colleagues,
My interest beyond the basic program of suck and fuck, is kissing. All girls rated above 5 asked for EUR 50 extra for kissing. Those that were 5 and lower were ready to kiss for no extra money. I would also assume that the latter do better in the room. At least in my case I had a 5 and a 2 that were very hot in the room.
It's a matter of supply and demand. Obviously the demand for the 5 and lower girls is lower, so in order to earn money and finance the EUR 80 they pay Artemis, they have to ask for lower price. In addition, as they session less and thus, are less tired, their service is better. So, my conclusion is that for the looks you can just watch the stunners and for the action and your pocket, select the others. Stunners are for watching, other are for touching.