I don’t know anyone who doesn’t immediately throw said enveloppe, postage, and letter in the trash
If you're being accurate, the people you know are terrible.
If someone sends me a personal letter [and I gather we're talking about a thank-you note here], I'm sure as hell going to open it. I'll probably even save it in a box for an extremely long time.
Yes so this is why the reason why person card/letters really matter because most people sheldom get any and if you know a person in your life / in any (community/project) that you deeply admire, sending them a handwritten mail can be one of the highest gestures which shows that you took the time out of your day and you really cared about them so much in a way.
That's my opinion atleast.
That interpretation doesn't save the comment, it makes it totally off topic.