The 8 1/4 thread

Why on earth would you not buy BBP axles for you 8 3/4? Dr Diff sells them for 300.00.
$300 American is about $410 Canadian plus I have an offer for the 8.75 of $350 $750 so if I can locate a 8.25 with BBP for $100 I am $650 ahead. Money left over for new wheels