seriously? inviting politicians and lobbyists to parties on your own dime?
Seems it's less a 'party' and more a networking event where I'm sure your competitors are not invited. Also less 'your own dime' and more a business expense that helps Bezos skirt even more taxes. I can't see it as an investment in the city.
Maybe if he bought and renovated an apartment building. Held events in a top floor space. Transformed the lobby into a community business and tech center.
It's not investment "in DC" as in "into the betterment of the city", but as in "in the area of DC (to promote to the powers there)".