First thing 41K against 30K. Sunderland have historically been one of the great clubs winning the league 6 times, that's 6 times more than us. Start looking then at their catchment area, similar to the Bar Codes. No major clubs within 100+ miles. Always had massive support because of this. but like the BarCodes they were averaging less than 20K in the 1980's and 90's. Even Mackems admit that the stated attendance figures are in most cases nowhere near the actual attendances, just check it out in their televised games. Don't know where the delusion comes from, didn't mention the Blades, you did.