There are deductions that can be taken without having a lot of money. Obviously, the large deductions are out of their range, but there are many that are available even if they qualify as 'just getting by'.
If you have never checked into the list of deductions, you won't know but one reason many can't take these is due to the fact that they don't know about them and they use the 1040EZ form, which can be filled out in less than half hour while watching TV.