Some more instructions/confessions from Mr. Frugality on ISG (note: I have added the bold in the quote):

Free Silom coffee shops?
Anybody knows where in Silom has coffee shops that don't require any purchase for you to just sit there, take off your shoes, prop your feet onto another chair, and relax while browsing porn on your tablet or smart and phone? I got caught in the heavy rain yesterday afternoon and had to use my skills at Starbucks. They have luxurious chairs for their customers. All I did was pretend to clear a table and snagged the previous customer's old cup and made myself at home. Did NOT have to buy anything. Was able to watch an entire full length porn movie. This was a nice feeling. On the way out, grabbed 10 packets of brown sugar for my oatmeal. I usually prefer monk fruit, calorie free, but I am always on a deficit anyways, so it doesn't matter much.

7-11 is great. Pay 26 baht for a cup at the self service coffee station. I took 10 packets of 3 in 1 espresso and added to the large cup. Then added a bit of hot water to half. Filled the rest with the cold Thai tea off the fountain. It was of course caffeine strong and sweetly condensed. Then bought a 1500 ML bottle water for 14 baht. For 40 baht total, got me 10-12 iced coffees to last over a week. ]

Thailand is a very conservative society, really. Buddhist, so the head is considered sacred (no patting of kids' heads), and the feet are considered unclean (as they are in most religions). And I can't imagine watching porn in public would be acceptable in Calcutta, in Sydney, so why would one assume it is in BKK?

Now some might be impressed with his frugality and ingenuity, but I don't think it's any stretch of the imagination that providers would not be, nor would managers/owners. While one might be thinking that the money saved might be lavished on providers, well, maybe not:

Booked a girl off TF in afternoon. The hostel I stay at has no reception unless there is a check in. When she arrives she sees 4 bunks in single room. Paid her extra 200 to do the deed behind the curtains of my bunk while my girl roommates where "I think" sleeping. LOL.

This is what the providers hear, what they see. While this is ONE bad apple, the attitude stench taints all. Instead of trying to solve shops'/girls' attitude problem, perhaps another solution might be to school fellow countrymen on acceptable behavior. Create a population where this behavior is the outlier rather than not all that surprising. Of course, you'd have to convince prospective students that their behavior IS a problem...