Wander into any Chinese "Massage" shop and you'd have to be pretty inept or undesirable to not be propositioned unless you're in your copper's uniform.
We are talking budget end punting here, no point comparing versus 150+ ph escorts who are offering looks and services, even if they still disappoint.
Not considering the clip joint "masseuses" demanding 100+ for extras on top of 50+ entry and who almost uniformly have next to no massage skills.
Genuine WSWS only occurs for me if I happen to try what looks like a genuine spa or pamper parlour, the kind where there are female clients on the premises. Current "frustration" is a nail bar that's always busy with ladies getting their nails done and the massage is done in a room in the basement, the lovely lady delivering those has never strayed her hands near my groin from front or back but she doesn't object to me being naked under a towel. She has pressed her pudenda against my foot most times I've been in and grazed her covered breasts with my fingers when working my hands. She's even mentioned working at other shops where we both know extras are offered but said she doesn't do that.
The "adulterated" WSWS experience in parlours, known or unknown, becomes WSWSBAG ("Be Any Good") or WSWSGATW ("Go All The Way") and there's still reward in that for me because any half decent masseuse is still more sensual than a regular budget escort and just as likely to be fun or a disappointment with the sex acts. So whilst you lose "sexy time" to the (attempts at) massage you could get a therapeutic or erotic tease from it. An escort might allow you time on target for twice as long but then unless you're punting one with a good rep or a regular you know then you could be pissing the entire sexy time money away on a no hoper. With massage joints you only waste the house fee as purchasing the extras is not obligatory.
Also if you choose your parlours right then the girls aren't doing more than HR/B2B for much/most of the day and so some can be quite appreciative of the extra attention (and cash). If you do find a lovely who's willing to indulge then your mileage can be very good value, especially if you don't "make it rain" in your fluffiness. A regular (or randy stranger) may well be hot to trot from the start and a full hour of fun might be had for under a ton. There's even the prospect of getting some private arrangement away from the shop.
Getting past 3rd base in a small room on an uncomfortable table may be awkward and off-putting for some but if you get a charge from being overheard, trying to stifle your ecstasy, having the occasional cramp in close quarters, banging the walls or having the receptionist knocking the door because of the noise then parlour antics can be fun. It's all very Carry On or tempting discovery in public or shared home places.
I see the visiting services as more of a scam as the woman can easily claim to be a pro masseuse only (despite much reporting here indicating that few are really much good at it) and then demand inflated prices for their menu of less than full escort services from an excited man in his own home or hotel room. With no rent to pay they still make a tidy sum from the booking fee with minimal additional expenses if they're declined or choose not to indulge the ugly, horny punter. Some of the girls are pretty and most are younger than most parlour girls but few compare to escorts that you'd be paying the same price for @ 150+ ph with no ambiguity of services wanted.