Lobbying exists because the return on investment is ridiculously high in favor of person asking for favorable treatment from politicians in policy making. It is peanuts invested and Boeing 747s harvested.
If anything the cost of buying a politician should increase multiple orders of magnitude. Currently hundred, two hundred thousands to a senator's re-election campaign can buy really serious attention to your concerns. It needs to be hundreds of millions to buy a senator.
Politicians should start Patreon campaigns to get livable wages from supporters and then just execute on what they stand for. Bernie and Trump was essentially that, self/people funded efforts.