How Lobbying Became A $3.5 Billion Industry [not very large by percentage of GDP]

 https://youtu.be/FZVfTCBUkgM

3.5 billion is not a large number.
https://tradingeconomics.com/united-states/gdp

3.5/21427.7 =

1.6334*10^-4 is appx 1.6% of the US economy as of 2019 GDP size
Yes it is about the money, yes it is about the power; no, more lobbying as a percentage of GDP could happen as it is a social tax (not a tax that is paid, it is a tax of time and opporunity cost, not money)