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I share the sentiment and here is my observation.
Environment (room and setting) -- more often than not, SP places are generally drab and shoddy when compared to that of higher end MPs especially when it comes to supplies of towels, body wash, etc. (not to mention the warm, toasty towels of SRM ).
Discipline in hygiene and cleanliness -- at the end of a session, in most MPs, you'll witness the attendants taking the shower, cleaning and making up the massage table again. It's a process that they all follow unfailingly. But I have never seen that taking place with an SP. In the business of imtimacy, to consistently demonstrate care and discipline on hygiene and cleanliness can be a crucial factor for many clients.
Seduction & teasing -- this seems to be a constant component of an MP experience whereas with SPs, it's non-existing more often than not. When I started hobbying a few years back, I was lucky enough to be initiated by the City of Angel gang: Jamie Lee, Ava, Meagan. They all followed a process of seduction and teasing that really drove me wild. But since they had misbanded, I had only come across a couple of SPs that practised similar routines. Others are simply "wamp, bamp, thank you gent". In my opinion, good sex is inevitably the production of intended build up. The more deliberate, the more intense the outcome.
Same as massageplanet.netid, I got drawn back to an SP once in a while by some great reviews on the Board and almost without fail, I was reminded once again why I switched to MPs some while back.