Na it's complicated, you impress them too much they think you might be husband material and they wont wanna sleep on the first date because they dont wanna appear slutty. Sometimes women wanna get laid too, and a casual mcdonalds run gives that chill vibe where you can just fuck and not think about where is this going long term. Personally i have like a ten percent rate getting laid after going out and spending a lot of money, dressing up to a nice restaurant, than just casually meeting up maybe i spend money on fast food maybe i dont, that's more like a 50% hookup rate to be honest.