IMHO, it's worth it. It's the longest running advertising site, and appears to be popular with a lot of punters. And after all, if you get one 1 hours appointments from a deluxe ad, you've paid for it and more.
Its a bugger having to get a credit card (or a pre paid one in my case), but I whack on enough to see me through 3 months every time (which is less than 1 appointment anyway) and I can just withdraw it when I like.
It always amazes me, because punternet doesnt come up very high on a search for 'BBW ESCORTS' but once a month, I still get someone saying 'Oh, I found your ad on Punternet...'.
I can only go on a BBW point of view, but maybe try it for a month, and when you're talking to your clients, maybe just ask them where they found your ad..and if they say Punternet, you know it's paid for itself.
After all, gotta speculate to accumulate!