Popular TShirts = Popular Products?

Many companies are able to get paid to advertise by making famous logos that people want to wear on their clothes.  I am guilty of owning a few shirts that have nothing but a logo of a brand on it.  I might not even like the product, but liked the design enough to wear the shirt.  Instead of paying to put posters up, they are selling clothes and making a profit, and getting free advertising.  Would you buy a shirt of a company you don't like if you really liked the shirt?