Not really. Folks buy tractors to perform a task. It's a tool. As the tasks change, so do the tools. And for some, the tools can be depreciated. If your level/type of work changes every five years, there's nothing wrong with changing the tools.
A large number of owners do not use their tractors for business. So, there is no opportunity to depreciate. Besides, an automobile or truck is also just a tool. And many many do keep both their tractors and their vehicles for a very long time, but probably keep the tractor even longer.
Yeah, if one is in the situation where they are replacing their tools every few years, then it makes since to buy the ones that are the easiest to sell at the highest resale price. But, for those that do purchase once for their lifetime, as long as it is reliable and parts can be had, then resale value means nothing.
I look at like this, I take that $3000 saved by not buying the "better" brand and invest it for the 20+ years that I'll own that tractor. I'll bet ya I'll come out way ahead even if I give my tractor away at that point. It's the time value of money that long-term purchasers should give greater emphasis.
And if Kioti's are as good as I think they are, in 20 years they will have established their own reputation for quality and I'll get every penny of what it is worth if I do ever sell it.
Now, if you have to sell within 5 years of original purchase, you might have to take less. But, to Wallace's point, you paid less to begin with. Here's a real life example: Local guy buys a TYM T273 with loader. Pays about $11K for it. Has to sell in with just 75 hours. Gets $8500 for it. Similar tractor, Kubota 7510 with loader. Guy pays just under $13K. Sells it with less than 200 hours for $10,500. About the same depreciation. For me, the TYM was a way better deal too.