I have done a few speed dating events and they rock.
You need to be well dressed and come up with some clever and interesting routines based on the simple questions you'll ask and get asked. i.e. "what do you do for a living". "what do you do for fun" etc. You only have five minutes to chat these chicks up so you'd better plan ahead. It's like a job interview. If no chicks pick you it means you really did not prepare. They are all single and wanting to meet new people, so you need to be your best self, be fun, charming, interested in them, etc.
I matched with every chick I picked (and I was selective) and got a few dates and lays out of the whole thing. Definately worth the time and money.
Don't give up on it.
Cesare Cardinali