When dealing with girls, not just in shops but in general, their attitude towards you tells you everything. If she's treating you like plan b or plan c, it's time to move on. Your level of interest in a girl is literally the LEAST important factor. Now I'm not talking "alpha dawg treat bitches like shit" attitude, that's just being an obnoxious arsehole, but if a girl, or shop, doesn't respect your time, and moreso in this game, your money, they are not worthy of your patronage, and so move on to greener pastures.