I agree with Mr White, certainly a mixed bag.
On the positive side, I have met one young lady who I have seen on half a dozen subsequent occasions and who accepted my offer of just over half her regular fee and has kept that price on later meetings.
On the negative side you have to be prepared to sift through a lot of dross, I have had bids from TVs, women who were 15 years older than my listed preference, ones who wanted me to pay well over their listed rates, Dommes responding to my request for a sub and ladies who had exactly zero of my requirements on their likes list and when I enquired about them told me to check their profile.
So, if you can accept that it is a lottery, go for it: it isn't a huge financial investment and the *chance* to save a considerable sum is always there.