Absolutely nothing.I am not ashamed to buy clothes from a thrift shop because I cannot afford to pay full price as I am on a budget.Just my two cents.

I bet you dress better than many "retail shoppers" too!
And anyway, why should anyone pay full retail prices when there are treasures out there waiting to be found at literally pennies on the dollar? I would much rather spend my extra money on other things, like house maintenance, trips, etc.!
It's funny, I used to love shopping at Ross, Marshalls, TJ Maxx, etc. but not anymore. There are two local thrift stores in my area that carry awesome clothes. I'm talking brand names, like JCrew, DKNY, Calvin Klein, etc. - I once brought home a whole trash bag full of clothes for around $70. You really can't beat it.