Mine arrived today, no signature required. Fortunately I was at home and heard the knock on the door so they were only sitting outside for like a minute.
Yes. I can't attend every game, and I have a set of 4 cause we like to go with friends sometimes but they can't attend every game either. So I sell about 1/4-1/2 of my tickets. I think that's pretty normal for STH's, much more rare to find someone who uses their entire season.
You'll never sell preseason tix on NFL TX anyway because their minimum price is way too high. Sometimes regular season games are hard enough to sell at face. But when you can, it's better than StubHub where they take like a 30% cut. And yeah it really sucks waiting so long to list them, most people who want tickets for the season have already purchased them by now.