What the heck is up with 8-3/4" rearends?

Well if your buying one that's properly built already they cost money..i know i've got 1700.00 in my 8 3/4 good parts add up fast..Moser axles $410.00..center section built 3.91's trac-loc sure grip bearings seals $1200.00..new brake drums $80.00..new shoes and hardware $20.00..damn that's a built dana 60:D:D