Buy the dip is a fools errand. I'm not even sure buy the crash is wise at this point.
The "bitcoin can only go up, buy every dip!" crowd has been getting rewarded for an abnormally long amount of time, so it's inevitable a bear market rape correction sweeps in at some point to dislodge a fool and his money.
Yes, it's called gamblers fallacy.
How do you guys know these trezors and ledgers aren't getting intercepted in the mail and their guts stuffed with something else?
The Ledger is designed in a way that, if tampered with, then it won't work and it becomes obsolete. Basically the Ledger itself is tamper-resistant, so there's no need for tamper-resistant seals on the packaging. Don't know about the Trezor through as I haven't read much about it.