I've just been reviewing my spending over the past year on WGs, and although it's been a fair chunk of change (to me, anyway), overall I feel it was money well spent.
Besides having very entertaining sex with different women, on reflection:
1. Sex is a lot less important to me than it was as part of a relationship, as I know I can get it elsewhere easily. This has enabled me to focus on other parts of the my relationship without all the conflict, anger and resentment there was previously, which has really benefited things.
2. I used to get infatuated with girls really easily, which caused me a lot of trouble in the past. Now I know that I feel that way after pretty much every good sexual encounter, I don't get wound up about it any more, I just look forward to the next one.
3. Sort of related, but it's allowed me to completely separate sex/lust & love in my head. Lust is just about chemistry, whereas love is something that takes a long, long time to build up (for me, at least)
What about you?