Quick reply...
I do "thank" almost every post - it's my long-standing practice to thank every post in the threads interesting to me, as long as their posts are at least somewhat informative. I do not thank disrespectful, rude, or insulting posts, and I avoid thanking empty or off-topic posts. Sometimes I seek out a way to give as much thanks as possible for a particular achievement-contribution: I am in awe of CSSU, MBarcode, ModRana, QStarDict, for example.
In part, it might be my attempt to encourage people to use this website, to visit this community; for instance, to buy&sell devices here, instead of simply putting them on EBay or something similar. I do not wish them to think nobody is appreciating their offer, even if I am not going to take them up on it.
Best wishes.
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Per aspera ad astra...