If the lady, is young, fit and well reviewed I usually pay about £70-£90.
Like the Collector I put £100 down for 30 minutes with Emily Creme Brulee. Must see her next year but after hearing of unnecessary preferential treatment for other punters, she's currently outside of my shortened hotlist.
Unless she texts me to say she's left her door unlocked, a trail of pink rose pettles leading from the hallway to her bedroom going to pass her up as my 6th choice for 2016.