I don't know, I'm kinda torn on this subject. At a high level, society wide point of view, sure, we needed (and need) to keep the real nasties somewhat under control, whilst there were and are plenty of nasties out there, the AIDS thing brought us all a big wake up call back in the eighties.
At a personal level, I cant help but agree with Zacory above, condoms don't provide an experience thats even close to the natural thing. I mean, that is what it is and we have to deal with it, but I often reflect how when I was young, dumb and full of something back in the eighties and nineties before I discovered the joys of the punting lifestyle I rarely used condoms and on many occasions even if I did then the girl would rip it off at some point during activities - it was a common occurrence and in the heat of the moment I don't believe I ever objected.
Talking with mates of mine both around my age and quite a bit younger, those who prefer the club/bar scene as opposed to the punting scene, if they can be believed, condoms are used but its hardly common with the vast majority of those encounters being bareback - this despite many of them occasionally visiting WL's and apparently -always- using condoms in _those_ encounters (doubtless due to the WL's insistence I'm guessing).
If urban legend can be believed then the rates of STI's among WL's as a group is significantly lower than among the general population, doubtless due to the majority using condoms as well as not remaining undiagnosed for long periods of time I suppose - so there's got to be an ultimate truth and positive ramification to condom use ... yet, I just get the feeling that for the most part we boys and girls are simply out there humping away, as nature intended and again, for the most part, we just accept the risk and consequences.
From a purely business perspective, yep, understand and fully accept a WL's point of view - a busy businesswoman can't afford to even go there, and as others have rightly said - why would you?
From a punters point of view, the argument isn't likely to be the same, thus the enquiries I suppose. In fact, it just occurred to me as I write this, that if those supposed numbers per population of STI's are to be believed then statistically one might be -less- likely to gain a problem barebacking a WL as opposed to a random pub pickup. Thats probably drawing a long bow actually, as numbers of WL's who would offer such services are relatively low and STI's may well be clustered around them as a result of this choice ... who knows the truth of it?
I suppose, even given my pontification and chin scratching, its a personal risk assessment from both parties, with little to go on in making that assessment, so, a true gamble. I'm not surprised that its a service often asked for, and I think its no harm for advertising ladies to make it clear, right from the get-go that such services won't be entertained.
What I do worry about though is when I spot advertising on the normal sites that are clearly linked (ie; same house or boss) that offer natural services by several or -all- of their girls. This smells strongly of coercion to me, as it doesn't seem likely that very large numbers of ladies offer this service and to find them collected together in this way seems even less likely. I'd really hate to think that some of the girls are being 'forced' to offer such services.