Edit: Or if you create a conference that will largely be attended by tech employees you can make bank with a few months of after-work grinding. (Also odd how the op slips in shibari reference in a tech paper.)
Most the people I know who organize conferences or are a part of organizing conferences don't make much "bank" to brag about and it's mostly about getting contacts, having fun and giving back to the community somewhat for them. But these people are all based in Europe, maybe elsewhere it looks differently.
Just making some extra money after the day job.
Here's one strategy:
Grinding leetcode has an upperbound as to how much 'bank' it contributes, and in some conversations people would laugh and say that small amount you are talking about does not constitute bank as they sip on their fancy little drinks on their private jets whilst going through their contacts list.