Of course if I could get enough customers I could do this full time, but I would need to get certified as a public accountant and then I would probably need to get some tax preparation software for professionals to make sure that I could really do the work right. However I have been able to get enough work for the purpose that I have. Obviously a lot of people do not want to do their own taxes, it is a real burden and I have been doing the job for a good long time and I am good enough to do it for most people. If you are a rich person, then you need a whole army of accountants to do their taxes, but obviously they have a lot to gain. A billionaire probably spends millions on the accountants that do his tax preparations and he is going to operate all of the time so as to minimize the cost of the taxes for them.
A normal person just wants to save where they can, but you do not want to be taking a lot of unnecessary risks. It is foolish to invite the IRS to come at you if there is not a reason to do it. They will ruin your whole life if you are silly enough to give them the opening. I have been working at this sort of thing, figuring out what is the right way to react when you get in any situation. I do not take the chances that do not make any sense, but if you get a big enough reward for it then you are going to take the measured chances. It is stupid to see how far you can push things, unless there is a real benefit and a sensible risk.