You're joking right? https://www.statista.com/statistics/257364/top-lobbying-industries-in-the-us/
And for you last point about NAR, I have doubts. I could see home builders and home buyers benefitting from zoning changes. It would drive down costs of a new home, open up more choices for home buyers, and put construction companies to work. Realtors are middle men who work off commissions. The more they can sell a house for the more commission they make. Realtors have a vested interest keeping the market balanced in their favor.