Is this considered rude?

Funny this subject was brought up again. Over the past wk I have had the pest control at my house twice. On both occassions I had the employees ask me how much money I had invested in the car. I'm guessing they are asking me b/c the car is so nice. At first they just keep saying wow, wow, that's so cool, wow, then they say, " so how much do you have invested in the car"? I always just reply with.. too much, and laugh!