I have also heard that already eaten and dried corn husk can do an adequate job in place of toilet paper.
It's pretty sad that some people wouldn't realize they are just getting their own money back that the government already withheld from their wages. On the other hand for most people that get money back I can't really blame them for doing it that way. If you're somebody that makes a good income, like say 200,000 dollars a year, then yes, it would be smart to get as much money as you could upfront, make money off of interest and investments, and then give the government the taxes you owe. You would come out ahead and it would have a good chance of it being worth the effort you have to put into it with that much money potentially earning interest and other things for you.
For everybody else though it's just to much of a hassle, and the risks if you screw up somehow aren't worth it. For people to go through all that effort in investment, not to mention careful accounting to make sure they don't spend too much when they might very well be living on the edge, just to possibly make a marginal amount of dollars more and risk not having the money to pay the taxes when they come due if they missed something is not worth the hassle for most people, and I can see why.