You keep pushing this myth, but it is just flat out wrong and been disproven hundreds of times.
The Flyers have been a destination franchise, one of the most favored organizations for decades. Post the salary cap, that has changed to some degree since their money advantage has been blunted, but they are still able to attract good talent here.
The 76ers during the golden era of Dr J, Cheeks, Toney, Moses, Barkley et al. were a total destination and even during the Iverson period players wanted to be here. Now with Embiid & Simmons, even after the 76ers many mistakes in building the team, Harris signed long term here and players like Horford signed on
We know all about the Phillies most recent golden era and, between 2007 and 2011, players were signing here for less than market value and lining up to join the roster.
Eagles have also been a destination team since 2000 when Reid, Banner and Lurie turned the organization around and built the foundation that still exists today - now since 2017 with talent like Wentz, Cox, Johnson, Ertz et al. players love the Eagles and want to stay here - we just heard from Sproles as the most recent example.