I quite often will repeat with the same WGs especially the ones I got great service from.
Generally at any one time I would have 3 "regular" WGs I rotate.
I find the service becomes better and it feels more like a GFE experience.
However a problem does occur later and that is they can become lazy and think they are at your apartment to watch TV and have dinner with you. It seems I have to remind them what they are really there for.
Also the more you repeat the more they expect a BF GF relationship and hence expect you to buy them clothes, jewelry and other items.
I still repeat with some girls I met 5 years ago but because I manage the frequency of visits they understand the relationship.
I repeat when I want a guaranteed service level and look for newbies when I feel adventerous.
Just my thoughts....