Everyone seems to have their own definition of PSE, it seems to vary by city, agency, location of advertising, etc.
I know of a lot of people who do not consider PSE to include BBBJ, CIM/COF, DFK, DATY, Greek, etc, so if that's what you're expecting from a girl who advertises PSE, you might want to check what that actually means for her or in her city at least.
I'm from Victoria, not Vancouver, so it's probably a lot different over there, but what I've been told is that PSE is a type of girl, not an extra service. In this case it means that she will look & behave basically like a safer version of a pornstar. She will have pornstar-type looks, she will be very enthusiastic & aggressive in bed, she will be very loud & do all sorts of weird positions (& many positions in one session). This does not necessarily cost any extra, nor will she necessarily provide any "extras" such as BBBJ, COF/CIM, Greek, etc. She may not do kissing or more "intimate" things & is probably not big on conversation or cuddling.
PSE can be used as a way to differentiate from a GFE (GirlFriend Experience), which is kind of like what you would get if you had a hot girlfriend who loves sex, only without strings. She will chat with you, cuddle with you, be nice to you, have lots of foreplay, do DFK, DATY & so on. She is also usually a bit more girl next door in looks than the PSE, (maybe natural breasts etc), but it's really more about how she behaves that gets her this acronym.
However, I have also heard that in some cities a GFE means she will do everything a girlfriend would do other than BBFS. Or in some places PSE may mean she will do everything a pornstar would do, other than BBFS. So, as I said, the definitions really vary.
There are also girls who will offer both PSE & GFE, you just have to specify what you like.
But maybe in Vancouver there is a more standard definition of PSE? And it may be a lot different from what I've outlined above?