A Thrifter is a low level player, or opportunist. In a broader sense, a thrifter is a purveyor of second-hand pleasures.
Based on the Jim Thompson novel and 90's film adaptation, "The Grifters," a thrifter is anyone who makes a living by scoring objects of worth from Grannie's yard-sale (i.e. suckers) and reselling them on Ebay or a Flea Market at a huge profit. True thrifters live in second-hand style, rocking used clothes, furniture, music, books, etc. Conversely, thrifter may also be used as a compliment.
Die-hard Thrifters end up owning boutiques, peddling antiques, old records, vintage clothing, or graduate to become pickers for Crate and Barrel, Urban Outfitters, etc.
Thrifters may ultimately learn a trade and become clothing designers ripping off designs from old clothing, or documentary directors, thrifting
the pain and suffering of others for their own benefit.
Mom, that thrifter you gave my comics to has my X-men #64 up on Ebay for 500 bucks!
Molly Rigwald's character in "Pretty in Pink" is a total proto-thrifter.
That was a thrifter move, ganking my ideas for your TV pilot, and then sicking your lawyer on me when I complained. Thanks.
Katy Perry is a saucy little thrifter, i like how she rocks an up-do.