Except they don't come back with the event. I know many people including myself were waiting until the last stage of the event in hopes the trees would be purchasable from the vendor and they were not.
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But they won't, though. SE hasn't had any event furnishings available for re-purchase, not even fixtures like the Bombard Lantern or Eerie Wallpaper that get destroyed if you replace them. If the event furnishings were available for purchase at the following year's event, the vast majority wouldn't be complaining about this issue.
Only the items that were untradeable get sold later on the mogstation. The trees in question are not only tradeable, but also market board sellable. It's like the Paramour Barding from the Valentines 2015 event never came back (in game or on Mogstation) because it is also tradeable and sellable.
It's probably because of the whole mess with the Eternity Rings where people were selling them in game for gil that they don't now sell anything on the mogstation that is tradeable.
That issue was already addressed. All they have to do is add the Market Prohibited/Untradeable tag to them just like they did when they added all the dyes - that way said person can buy as many as they want for their house, but cannot sell or trade them.
No, it should be put in the mogstation. Why? Because I paid for the game subscription when the Cherry Tree event was around, so that I could get a Cherry tree. People that weren't around back then didn't pay for the sub, so why should they get them item that I had to pay for?
Of course, I don't really think like that and I don't care if they mogstation the item or not. But the point I'm trying to make is that you are not entitled to a limited item just because you pay a sub now, when you didn't pay for a sub back then. That's why it's limited and that's why some people think it should stay that way :)
Put it on the Mog Station. I'd rather SE earned money from it and cycled it back into making the game great, than leaving it as this limited item that's in high demand but will never be given more supply. It's just a waste of assets. Even if it was $1 a tree on the Mog Station, SE would be making a pretty penny.