Well, I guess you ARE attempting to solve the problem of corrupt lobbyists. Why pay an org to bribe a politician when you can instead just listen to people arguing for why only the ultra-wealthy who can afford the cost of trading should be able to benefit. What next, punish the tobacco industry by giving every school child a piece of nicorette at lunch?
That said, I do actually very much agree with a wealth tax, with caveats. First home (which you are already paying property tax on) is exempt. Same with very specific retirement funds. Probably one car per person because that would also predominantly hurt the lower class, although I would probably make it a fuel tax since that would impact climate change AND de-value the resell value of a car collection.
Because there are solutions and many economists have proposed and studied them. But “We should make stock trading more expensive so only the ultra rich can do it” is not at all a solution.