I'd love for you to point me at where I told you what to do. I made a suggestion to potential buyers, gave my advice, opinion and offered a reasonable alternative. All I said was that it is a bad idea to purchase a hardware wallet from a third party seller if you are planning to use the hardware wallet as intended (to store coins).
I always find it amazingly entertaining when people flail like a fish out of water about "sales trashing", specifically when nothing except facts have been stated and you haven't disagreed with me once.
The right precautions would start with:
Step 1: Purchase from the manufacturer
Just because there are people willing to buy something, doesn't make it a good idea.
I'll take a page out of your book though and say:
If I want to explain the pitfalls, dangers and potential security problems that will arise with a secondhand hardware wallet then there is nobody that will stop me. Crying about sales-trashing, and telling me to just "move on" unless I want to purchase your tainted-goods is just making you look like a clown.
Somebody that needs to save $20 by buying the hardware wallet secondhand, clearly isn't in need of a hardware wallet at all.
If you believe that all of the vulnerabilities, tricks and bugs are known then you must fall into category 2. Side-note: When you're insulting someone, I'd suggest being more direct, rather than beating around the bush like a scared animal.
You're being dishonest about the risks, in order to make a quick buck, which is a hallmark of a conman. I legitimately had no issue with what you were offering before, and simply wanted to give a quick warning to those that may be unaware. Now though, you're lying, insulting and telling me to leave the thread because my true-information is sales-trashing. Good luck with sales!
Most of your images have gone stale, too.