Good for you. I'm in my 30's, look a lot younger, and dress like a bum. I really do. I don't know why, but I just don't care about clothes.
Saw a 2008 E93 in a Landrover dealership last September with low miles. Stopped in on my way to order a new 2011 E90. Test drove it, and offered them 48k, checkbook IN HAND. The salesman made me feel like I was a douchebag because they had "over 52k invested in that car". I asked "the one with bald tires and about to go off warranty?". I left and ordered a new one from BMW. And they didn't care how I was dressed.