I don't think it's odd. I very much would like to see an American girl here in London too but they all price themselves as if they're Jenna Jameson
Well we know the reason for that, as prostitution Is illegal In the land of the free, they charge a premium over there, so If the come to work abroad they have this In their head, and also simple supply & demand, as there are few genuine American escorts In the UK, they can or will charge more.
US pornstars who tour In London with Photogirls actually take a wage cut, In LA they charge around $1000-$1800 p/hr In London £500-£600.