IMO, I look at it from two perspectives. If I were shoping for a tractor for myself, I would consider a Vietnam rebuild. Heck they are considerbly cheaper, There seems to be more and more available with a vast selection in sizes, years and attachments.........and I am confident that any repairs from the smallest to the most complicated I can fix. In fact I am guilty of fussing over items that might be suspect and replace them.
But if I am going to buy tractors to sell, even as fussy as I am, that uneasy feeling of undocumented hours and ware and tare comes into play. The bigger the dealer you are, the higher the risk of damaging your credibility and reputation.
So, I completely understand why people buy tractors reconditoned or otherwise from somewhere other than a direct import from Japan.
I also understand why better dealers don't.