Actually a lot of people here spent way more per shot in spas like Perla/Flirt.
For $300 incall I get 2 shots, that includes shower with girl, BBBJ, plenty of foreplay and a nice bed to make love on. So that comes to $150 per shot. The girl is usually very attractive, I usually leave satisfied.
For Asian spa, I spend $140-$160 for one shot, I get covered blowjob, very little foreplay (sometimes girl insists on a "massage"), a tiny massage bed, and rushed sex, sometimes they don't shower between clients so their tits smell like the previous guy. The girl is usually older and less attractive on girls from incall, and I often leave with a shitty feeling that I got ripped off.