Just to share from my view, to go into the BY scene..... its not just the $$$$ that you parted as a patron's and get to have that inclusive piece of meat. In a real BY scene, be it KTV/Singer/Waitress or Model SYTs, One will expect a certain demand of timeoff apart from having quickies and hardcore sex.
(Apart from buying Baggies/Clothes/Nice Meal)
Then again you need to brace for yourself the emotional roller-coaster which will be coming as part of the KCed Voodoo and it's all depend on how you react to those unwanted "Noise-or-Nuisance", hence its not you that trying to get the vested worth, but vice-versa.
In the BY deal, there are levels of engaging method and tailored/customized.
The fundamental are to note, which is to match within your mammon and your schedule, and how you are able to monitor your vested interest. Having all these is only basic, next be mentally engaged and anticipate as and when you are both in quality time and dialogue. If you understand what I mean, you are halfway to success to manipulate their emotional and fine tune along the way to get their "hearts" stay tuned with you for the period or even extend beyond their course of stay here.
(Its either you clear them flat or you will become their ride) Hence, any BY the 1st to 4th week is usual the honeymoon period.

Any longer, you will need to shown your Mastery Mind and tackle it at the back on their mind. Which can range from any small issue to smoothing with a wet kiss and always getting a better sex in return, if you carefully understand and study the body-behaviour.
Just my 2 cents sharing.

Cheers,
OL