I can see both sides to this ....
WG's are in it for money! As a punter, you keep their "business/income" going and it's obviously in their interest for you to like them. However as a new punter myself, I'm choosing girls based on their appearance in photos, services and UKP reviews. All it would take is for them to have a great, attractive personality to have feelings for that woman too. Obviously they have to like you too ... for real, not just acting it out for your money.
Being a couple with a WG you found attractive sounds nice, reality would be very different. I very much doubt I'd want a future partner to fuck all the local guys, be away on tour, etc. They would carry on working for sure. WG's I've spoken to have had husband's, kids etc so it obviously happens, just not for me.
If I ever met a WG I really fancied, I'd leave wishing I'd met her down the local pub instead, start off a relationship "normally."