Is anyone doing this? It's an interesting business model as the product is money so you'd only stand to make a profit never a loss.
Most of the people I know who do bank roll hunting and doing it because it's just kinda fun and there's a thrill when you find a silver quarter from 1964 (worth about $5) hiding in a roll of otherwise-normal quarters. But so much of the good stuff has already been plucked from circulation.
Having said that, nothing should stop a good hacker from doing something just for the hell of it :)
>product is money so you'd only stand to make a profit never a loss
you're grabbing the expense part of the business that everybody else is trying to shed. Let's talk also about time value of money. All the money that you've invested in cash is not making money passively as other investments do. Compared to putting the money in the stock market, you're losing 7% a year on this scheme, plus the expenses of running your business, and opportunity cost of not doing something else that generates income.