Talk about being super rude... You just bullied the shit out of the dude and ripped him a new one for free lol.
Your point and frustration is valid when it concerns well-reviewed and legit SPs like yourself and Adèle, to which most would agree with you that there should not be an issue in paying in advance, especially given your reputations as providers. In your case it's very easy to convince the dude to pay in advance. Just tell him to read the reviews or show him your reviews and he should instantly be comfortable paying in advance or at least putting the envelope somewhere you can see it.
What about when we TOFTT? When we go on humpchies, annonce123, annonceintime, leolist, etc and see non reviewed girls who do not advertise on merb? Do you have any idea how many girls out there are scammers who take our money and ask us to leave, threaten us, or straight up refuses to provide the agreed upon service? How come you don't look at it from the client's perspective also? When a client gets ripped off more than once with scammers he also has to take precautions in order to protect his hard earned money. Do not get me wrong, I'm not saying that it's not risky for the girl but I'm hoping that you can see that it can also be risky for the guy and hopefully you can understand why some guys can refuse to pay upfront when seeing "unknown" indies who only advertises on these sites where anyone can post an ad. Humpchies now has a comment section and I can see that there are alot of girls who make the clients pay in advance and rip them off in various ways. Sure, some comments are just competitors trying to destroy the girls reputation but many are real also.
There is risk involved for both parties:
When girls do not ask for the money upfront, you are right, the girls risk not getting paid after the encounter
When the guys pay upfront, they risk not getting the actual service, getting caught by LE, being kicked out and threatened (yes this happens more than one would think)
You're probably going to say that guys should only stick to reputable agencies, well reviewed indies, merb advertisers, etc. Sure, but a lot of guys prefer to look TOFTT and browse these sites and find girls on their own and in doing so they learn to take some precautions, including not paying in advance due to bad past experiences. Many well reviewed girls don't even know about merb and only got discovered thanks to us guys who decide to take a risk on these sites.
Personally, I always deposit the envelope on the night stand as soon as soon as we get to the provider’s room as I understand that it makes things much more comfortable and totally understand how in can be a huge stress factors. I really get it. I also want to avoid any awkwardness and want to avoid being asked for the donation so I make sure to quickly deposit it in advance. I'm personally willing to take the risk of losing the money to having a so-so encounter because the girl is anxious or afraid of not getting paid. Je comprends 100%. I'm also fairly good at sizing how the encounter will go within the first few seconds of meeting each other and have developed some tricks to avoid scammers, however I can totally understand that some dudes out there have also been robbed and want to take certain security precautions themselves.
You can disagree with this approach, but you can still be somewhat empathetic about it and recognize that there is risk involved on both ends when seeing girls that are not reviewed. This does not give you the right to insult people and be a bully.
In a perfect world, there should be some level of mutual trust and we should place the envelope somewhere where the girl can see it and hope that she doesn't attend do it until after the session. But we don't live in a perfect world and I totally get that both parties are just trying to lookout for themselves and it can be awkward and can cause issues.