Most people wonder why someone would pay him to do this, reports CBS News correspondent Steve Hartman.
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Lots of people pay him to do this - people with Web sites, a blogger, a PR company. They all want Jason to wear their logo - even though he's not a model, he's not famous, and some days he doesn't even leave the house. And what's even more amazing: last year he made $84,795 just by putting on a T-shirt every day.
Actually, Jason says there's a little more to it than just putting on the shirt - he also takes a picture of himself in the shirt. He walks all the way over to his couch - that's the most physical part - sits down, loads the picture onto his computer, e-mails it to friends and posts it on the Internet. That's his morning.
In the afternoon, he hosts a half-hour video chat on his Web site, Iwearyourshirt.com. There, people with even less to do than Jason, can talk to him about his shirt.
Again, just for doing that and selling a few ads on his site - Jason will net $84,000 this year. If you're saying to yourself, there's got to be something more to this - there really isn't. Jason has just tapped into what small companies, especially, are looking for nowadays - a clever gimmick to get their brand name circulating via social media like Facebook and Twitter. Jason says even when he stays home, more than 5,000 people a day see him in his T-shirt.
He started this on New Year's Day. He charged his first customer a dollar - then raised the price one dollar every day. By May he was charging well over $100 a day. By the end of summer it was more than $200 a day. And next month, he'll be making about as much as a family physician.
And at double the price, Sadler has already sold the idea into next year.
"Two-hundred and fifty-five have already been sold," Sadler said. "The next available day is Aug. 1."
If all goes according to plan, next New Year's Eve 2010 Jason will make $730 for putting on a T-shirt, and by 2011 he'll be making even more, by working even less.
"So your dream is to not wear shirts, but to hire other people to wear shirts for you?" Hartman asked.
"And then I get paid for them to wear shirts," Sadler said.
He's already hired one guy to do just that - and starting next year he has an underwear sponsor.