Vice: Collecting Things
ISTJs are misers with an affinity for coupons and rebates. The expression “a penny saved is a penny earned” was probably coined by them (pun intended). When they were young many ISTJs probably collected seashells, or rocks later graduating to collecting butterflies and coins. They also like collecting old things like commemorative stamps, $2 bills, rare baseball cards, autographed memorabilia and the like. They’re very fond of antiques and items with historical significance such as an unopened bottle of wine excavated from the titanic or the pair of undies Buzz Aldrin wore during the moon landing. ISTJs with abundant income may likely be found at auction houses bidding on useless objects worth a fortune.