If you owned a bus company would you pay a fee for each bus timetabled to use the bus station, the fees will rack up over the year, that’s mostly why stagecoach pulled out of Sunderland Interchange plus the added times to the timetable to divert the bus to and from the interchange, plus most passengers would board and alight from Vine Place/Holmside/John St and Fawcett street anyway, the same goes to Newcastle and other city/town centres.