Took few seconds to spot you (blame to your changed avatar :-D )
When I help anyone with info or anything, I usually do not expect anything in return but I have some good memories and I feel good about them:
https://bitcointalk.org/index.php?topic=5295408.0Anyway, I spot a lot of time users do reply with thank you but you actually do not have anything to post on that reply, so I leave it like that.
Maybe theymos needs a new button/feature, you hit it and other sees the post had a thank-you sign.
That doesn't really matter to me as long as they absorbed and appreciate the help that I gave them.
But saying thank you is really a good thing because it will show them the power of accrediting someone who helped them, give them tips, advices, and knowledge towards a certain thing.
Another feature can also be a possible thing so that there's no need to type "thank you" instead in just one click, there's already a thank you sign.