It varies alot from girl to girl, and also how often you visit one place. For example, if you put Vera in the equaltion I also believe none of those proposition will work. Also another thing to consider is probably knowing how girl work with other girl I guess, like another thread here on the board discussing about which pair and people giving high regards about Bella Chloe pair etc etc. One thing I kinda really like about NYAW is Sally really care about her reputation and willing to negotiate for us, even alot of those are not on my agenda before I walk in that grey door.
About the 1extra for no latex thing, I thought about it from time to time, but I think the latex is a last fortress to decrease the unfortunate event to minimal. I have friend who does that visiting Lear, but that is just not my thing. Oh, if you have Ollie as one of the girls, the covers gets an upgrade, I was told she pay for them herself, those ultra thin one is good enough for me.