I think an occasional freebie is just marketing.   I might be a bit cynical, but unless they forego money forever, I just assume whatever they say and do is to entice return biz.

… she’d have her pick of tons of younger, hotter guys than me!

I’ve had a few offers of free sessions, but they were due to making up for a NCNS or last-minute cancellation, not because the provider just had to have me even for free. On those occasions I countered with asking for a longer session at her hour rate, and that’s what we did. Also I’ve had providers tell me to forget the clock a few times during a paid session.

There’s been a few providers over the years who’ve seemed like FWBs in terms of how well we got to know each other and what we did together, but there was always an envelope when it came to sex.

The most common thing was an expanded menu (ex: BBBJ vs CBJ) and occasionally a freebie.  How much of that was appreciation for a good client vs any genuine affection is really hard to say and there's no reason it could not be some of both as they aren't necessarily distinct.  But I've always made it a point to remember that for the providers this was still their business.  I was simply happy to enjoy what was offered.

a massage only girl that turned into full blown sex (maybe uncovered) with no extra charge. Happened with me twice with same girl but am sure im not alone

After many years I have had "freebies" but nowadays I will always pay a donation even if offered.  It's important to the client/provider relationship to remain on a business level.  The business of pleasure.  Once that line is crossed then emotional issues arise and one begins to feel entitled and sometimes monetary favors are asked without intimacy.  It just leads into a level where the fun and freedom are restrained.  

It happened once but there was a situation wise, had a session at hotel, and we was well 30 ish min into the session… And then there was a phone call from service desk saying that they will come to change the lock on door.

Few min later maintenance came and knock on door and came in change the battery on door because it was it low, while I pretended to be her husband and watching tv and pretending to use the laptop.

Afterwards we finish up however time we had left and she promised that next time it’ll be free session. So I took her on offer and saw her few days later on weekend and it was even more amazing.

Stop kidding yourself, its all business, even in a what seems like a normal relationship, its still all business

Once you get into the business provider circle dont try to enter any other circle

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Oh yes.  Quite a few in fact.  I’ve been damn lucky.

First time in 12 years...woke up this morning to an email from a long time favorite that says "Tuesday sesh is free of charge btw. Merry Christmas and happy birthday to you."   Quite the nice surprise.  
Has NeveR happened to me before.  

I did end up being a FWB with a provider right before and after she retired. Depends on how regular of a client I became, I often do receive free “upgrades” and extended time with them.