I know, and the amount of people who use likes is about 10% !! :)
But no need to rant, you need the CBR approval / response system ! :) If I help someone, and they don't respond, that gets noted, and they get one more chance next time they ask, and if they still don't say anything nice, then they go on my cafe ignore list, never to be helped again ! Likewise if I think they are using their dodgy crack copies, or send me demanding private messages just assuming I'll help and have infinite time in which to do so, that's also a shortcut straight to my lists :)
But on the whole I don't need to block people very often (apart from the crack thieves who I usually spot at a rate of 3 every day !)
But most people are quite nice, and some people really go out of their way to say thank you - occasionally I get sent random paypal cash or 'beer donations'. And always remember, if you don't get thanked, who cares really - you did a good thing, and that in itself puts you in a morally good place you can be pleased about independent of anyone else agreeing ! :)
But thank yous are nice - of course everyone likes appreciation for their hard work, so your thoughts are entirely understandable...
CBR