BWI is not GA friendly in my experience. In a previous life, and without buying gas, I never got out of Signature at BWI for less than $1k. And that was in a machine with less than 12k gross weight. Landing fee, handling fee, security fee, parking fee, facility use fee, etc. They claim the MDOT imposes all the charges.
Besides, I don’t think commuting by personal plane is in the cards here.