I like to prebook , and Kgirls have canceled on me a few times because they didn't feel like coming to work that day or some other shit.

I get a little pissed, and I have found that if I rush to rebook with another girl the same day, I have a less than satisfactory experience, mostly because my original plans were crushed, and only lower tier girls are available at my time slot when  I get the cancellation notice.  

So now, instead of being an impulse buyer , I just load a porno, bust out the lotion, and imagine the sweet wet pussy of an ATF...  

I just saved a bunch of money on my hooker budget by switching to Vaseline.
And that feels nice.

I hope this investment tip helps you too.