Life in the crony capital, the Imperial City, is expensive. Washington is by far and away the wealthiest metropolitan area in the United States. It is here that the wealth of the nation has been aggregated and disseminated to defense contractors, federal employees, lobbyists, lawyers of all types, etc.
Frankly $108,000/year would still be kind of tight in the District.
…the city ranked 10th in the most millionaires per capita compared with states. As far as states go in that regard, Maryland has the most and Virginia comes in at number 6. That matters, given that both surround D.C.