If I were dating, why would I potentially waste hours with getting ready for a date and going on the actual date, if I had no clue whatsoever who was going to come and if I liked them at all to begin with?

I think there is a huge psychological barrier for people to go on such dates. The more 'successful' they are, the greater the opportunity costs with your model. You probably would have a self-selection mechanism that leads to weirdos etc coming.