There have been attempts at more up-market marinas in Philadelphia but none have got very far.
The Waterfront Square development had a marina in its original plan, and the marina is still in the condo documents, but was never built.
The Sugar House Casino proposal included a marina, but lots of scaling back including no marina.
The Foxwoods Casino that did not get as far as ground breaking for many reasons also included a marina.
Marinas at high property value locations cannot stand alone financially and need to be part of a value added feature to a larger development. The Penn-Praxis master plan for the central waterfront includes more marina locations, but without investors in major waterfront developments they are unlikely to happen.
1970 Havsfidra 20 by Fisksatra
On the Delaware River at Fox Grove Marina Essington PA