Count me in. While my offing and tipping habits are different than yours I see method and logic in way you operate.
As local so to speak you have an advantage of being insider AND having a time , luxuries not available to visitors.
correct although they may be different meanings of what each of us put under ' service ' umbrella.
And there's looks issue. To put it proletarian way , good fucking guy , not necessarily must be good looking . While 90 out of 100 guys have decent cock and/ or ass, perhaps only quarter of those are head turners in sense of looks , be it face or built or both. Which for some may be obsolete but for others be deal breaker.
again, while calculation itself is impeccable we are hitting wall at what 'good time " means for each of us. Combing through Grindr grid is not exactly the same kind of entrainment like sitting in bar, drink in hand and watching three, not two dimensional guys on the stage.
Some people may consider Foodland Patpong dump, UNESCO clearly thinks opposite awarding them World Heritage status.