if im gonna be paying for the dinner and i havent met the girl yet, i usually have them come to my town, preferably within 2 miles of where i live. so if they did all the driving, i feel justified paying.
but a girl who wants to meet half way, and then, after the food is ordered and time to pay comes and she doesnt offer to pay half or leave the tip, chances are pretty good i'll never call her again. and chances are pretty good she's wasting ur time.
although, ive taken many girls out who didnt offer to pay but was very into me and came home with me the same night. in those cases, i'll let it slide. but if a chick isn't pitching in on the food/drinks, and isnt willing to come home with u, chances are pretty good she aint feeling u at all. so dont try to play that don juan sh1t trying to win her over. just cut ur losses and dip.