I think it also depends on if $100 / hr can be extended beyond 8 hrs /day and 5 days a week. Often those high rates are for 40 hrs per week. Any extra hrs are either part of fixed salary jobs or unfinished deliverables for whatever reasons.
It also depends whether you consider cooking work or fun. Some people like doing it, others don't.
I don't make $100/hour and I do enjoy cooking, so I don't eat out that much, but I do believe for some people it makes perfect sense.