As I said in another comment, no one cares about free taxes as much as TurboTax cares about not having free taxes. It is a minor annoyance to every citizen, but it is life or death for TurboTax.
The people who are hurt by not having free taxes certainly can't afford lobbyists, and even if they could... they would have to spend so much more than they pay in tax preparation fees for their whole life to compete with TurboTax money. Who would do that?
Collectively, people spend billions annually on TurboTax. They could, instead, all chip in $25 for their own lobbyist, if they cared enough to not spend $100 on TurboTax.
If they can afford TurboTax, they can afford the lobbyist.
Couple of problems with that... one, not everyone would chip in. Why would they? If there is a fund paying lobbyists, my $25 is not going to make a huge difference.... they aren't going to win or lose based on my contribution, so why contribute? Your money wont change the outcome, and you will get the benefit even if you don't participate... standard Free Rider problem.
You might say that you should donate out to the fund out of moral principle of a just cause, but there are a million just causes, a million small rent seeking industries that do this sort of thing. Which of them do I donate to fight against? Why income tax and not one of the others?
TurboTax is going to be willing to spend a LOT of money to fight this... you are going to have to get a LOT of people to choose your moral cause, and donate to the PAC.... and then find even more when TurboTax spends even more on lobbying to counteract your PAC. Who is going to give up first?
The people who are hurt by not having free taxes certainly can't afford lobbyists, and even if they could... they would have to spend so much more than they pay in tax preparation fees for their whole life to compete with TurboTax money. Who would do that?