Only a small proportion of punters are on UKP. I've been punting for years and only recently found out about it. She's worked Edinburgh and Dundee so may be Glasgow next?!
I understand your point. However an AW profile can be taken down by being reported to AW and although a new profile will be created, it can also be taken down, thereby seriously disrupting activites - e.g by stopping feedback being built up, profile down while a serviced flat/hotel room has been booked etc..
I have no idea on what basis an AW profile will be taken down by AW- although Dundee punters have been succesful in keeping a certain scammer off AW - feedback was left on profiles and profiles were reported giving links to a thread here - although perhaps the crucial difference is that there were multiple AW/UKP profiles reporting the profile, leaving bad feedback or contributing to the thread here. At the moment there is only one report of being scammed by Sasha, so I guess she will be able to set up a new profile and given that only the op can morally report it, perhaps AW would do nothing. However, if she were to scam more than one, action could perhaps be taken to keep her off AW, as described above.
I haven't seen Sasha, but I chatted to her late one night for 15 minutes or so. Seemed nice, but I slept in for the booking we arranged the following day - punter flakiness that time...
Whatever happens, it will be interesting to see how this pans out..