Didn't we just have this thread? Oh well, here we go again…..
The number of used units for sale can be taken as neither a negative nor positive indicator. Given the post, I think that you see it as a negative reflection on Kubota. So, I'll take the positive factor side of the debate, and let others (who see it as negative) take the other side. In reality though, the only way to resolve would be to stop and ASK the sellers why. Take a sampling of a dozen owners or so, and look for a pattern (may only be random coincidence, and the number for sale has no reflection on any trend).
First, since they are for sale, shows that they have a resale value and a market. You are not seeing them at the junk yards.
If there are 100 tractors for sale and 60 are Kubota, then there is a good chance that 60-percent of that market IS Kubota. Natural attrition, people retire and sell property, or move up to a newer or larger unit. They sell what they have. And if Kubota owns most of the market, you will see more of them. Look at the flip side, around here I don't see any used Yugo's for sale. I do see a used Chrysler, Ford and GM's. Does logic tell you that Yugo is a better vehicle because owner's are keeping them? Of course not.