A thank you is never wrong, whether it be via PM or via the thread itself.
I don't think any of us who provide info demand or expect thanks since FT is about sharing, but when someone takes a lot of time or is quite detailed (as did
hhoope01 on this thread; great info), it is definitely appreciated.
I remember one time spending a solid hour writing up something for someone who was going overseas & it was really, really detailed. Not only did I not get a thank-you, I didn't get an acknowledgment that it was received (found out much later it was). Bit of a let-down. I wasn't expecting flowers or an upgrade (pun intended given the title of this thread

), but a simple thank you goes a long way.
Cheers.