If putting money in your pocket is not the object, I strongly recommend joining one of the VITA programs
. The average Boglehead has no idea how many people there are who are absolutely buffaloed by a 1040, no matter how simple their financial situation is.
I did this for two years in Chicago, where we were issued T-shirts saying "I spent my weekend doing taxes and all I got was this shirt", and then got bussed from the E&Y offices in the Loop to parts of town we would never set foot in otherwise. The average taxpayer who makes use of a VITA site, in my experience, has 3-5 W-2s, no 1099s (because they have no financial accounts), and rents a residence. I could do four or five returns per hour for such people, using pencil and calculator only. The most complicated piece was always estimating the EITC. (Complex returns - self employment, capital gains - are refused by most VITA programs.)
People were astonishingly grateful to have someone spend 10-15 minutes filling out pieces of paper they could not understand, either because they had a limited command of English, difficulty reading, or (commonly) a simple fear of arithmetic. If you want to help a few people out of the goodness of your heart in March or April, spending 15 minutes to do a professional job of what they could not do themselves in hours of puzzling (or end up paying Block $40 for), then consider a VITA program.