Indies
DFK/FK - Hate it, will avoid the WG.
OWO - Hate it, will avoid the WG.
RO - Hate it, will avoid the WG.
CIM - Wouldn't do CIM with that WG but wouldn't prevent me booking.
Anal - Would do Anal with that WG but wouldn't prevent me booking. However, I don't like seeing it for free as it feels like part of the base cost for that WG could be Anal, so free Anal listed is a slight negative for me (depends on overall price).
Watersports/Other kink stuff - Similar to Anal.
Parlours
If WGs get caught not charging extras required by the parlour they can get fired for undercutting their colleagues. This is why you shouldn't go shouting in your review about receiving something for free off a parlour WG. If they don't get fired, they are usually a lot more careful about free extras in future. Every time I see a punter do this in a review on here I think "you thick bastard".
Special mention for parlours, some WGs charge you extras by the half hour, so 30 minutes OWO is £10, 60 minutes they say OWO is £20. It is rare and I don't like it but do pay it. It doesn't happen that often but if you are not 100% sure that the parlour allows the WGs to only charge £10 for OWO in 60 minutes you should again be careful about reporting this in reviews.
DFK/FK - Hate it. Puts me off using the parlour. If it is a parlour requirement I will pay it if I do use the parlour.
OWO - Understand why it is an extra at parlours, I will pay for that extra.
RO - Hate it, will avoid the WG. Usually not a parlour requirement and is just a big sign to me the WG is shit.
CIM/Anal/Watersports/Kink stuff - Absolutely understand why it is an extra at parlours, don't usually partake and pay.
GFE - The ever mysterious GFE, usually asked for £20 when OWO is £10. I feel this has always been a 50/50 proposition at best. Sometimes it is a shit WG trying to up her cash with a first time clients because I bet she doesn't get many repeats. The other times it has been a really good WG who rolls extra passionate DFK, OWO, RO, COB into one and it works out reasonably priced overall for a good punt.