Suppose you have enough disposable income to pay for a new $1200 TV over the course of 12 months. In scenario 1, you save $100 each month. The bank pays you 0.5% interest. As of January 1st next year you'll have a new TV and $2.75. In scenario 2, you put $1200 on a credit card with a 10% APR. You pay $100 each month towards the credit card bill. As of January 1st next year you have a TV you've been watching for a year already and owe $69. You've essentially paid $72 for the privilege of getting the TV you wanted a year earlier.
Is that worth it? Well that depends on a lot of things, some of them intangible, but I wouldn't say it can't possibly make any sense. The sort of Puritan attitude towards consumption and debt may not be the worst attitude to have, at least for oneself. But when combined with evangelism it is pretty annoying.