I'll add that yes, the whole thing here is transactional and feelings have no place but you can't tell me with a 'regular' there isn't intimacy and trust that gets built over time. That sexual intimacy when you are repeating whether with a 'civie' or an 'SP' is what makes sex so good. With my regular (not always), I have sent her the full amount up-front many times and many times I have sent her the EMT and I have had to remind her a week after to accept it.
My point is that for me currently being super busy with work and life, I actually don't have time to either look for new SPs all the time or even date. So when you have a regular where you can trust and there is good sexual intimacy where both of you have actually enjoy the sex, why not reward "good business". She rewards me with a discount, I reward her with repeat business and we both have a good time. No lie, the last time I saw her, it was probably one of the best sexual experiences of my life. After we went at it pretty hard and were just lying in our sweat and juices, she marked, "Wow, this is just keeps on getting better and better". She could be acting but I don't think so and frankly I don't care.
So yes, you have to be mindful of the transactional nature of the business, but within that there is a some grey where you can actually have genuine fun for both people. At least that's the way I see it.