Teams like Liverppol and Man City are so much better than anyone else that there is no point in the Championship teams going full on to get through. The financial gain is dwarfed by the riches of getting promoted and players getting injured or clogging up an already long season isn't worth it.
Its a shame, in a bygone era an FA Cup Saturday with a 3:00 kick off was the highlight of the season. Gazza doing his knee, Norman Whitesides bender(:o), Ian Rush and his camera goal. Ricky Villa. Since the inception of the money league there are very few(Gerrard v West Ham) cup "moments" that stick in your head like they used to.