That's why it's called a 'tax return', you are trying to get back as much of the money that you should have been paying during the year to make sure you have enough to cover your taxes.
As long as he was putting money in - they don't care to keep the extra. It's his loss if he could've filed a return and gotten some of his cash back.
I always use taxact.com - it's simple, almost completely electronic (I had to print out and sign one form - I didn't even have to send in my W-2's!!!). It's like 20 bucks for a basic return. I've used it for years now - and I'm never giving money to H&R block or anyone else - ever again.
Some people have more elaborate tax situations - like if they run a small business or something - then it's a good idea to get some tax advice.