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yes it does have its place! :) i also use it for posts that i really love - and want to show a little extra appreciation for! (since my vote can be very minimal at times when i upvote too much hehehe) I prefer to use tipping the "simple" way - without adding my own post to the comment. (some people use it for a tip AND self-promotion) I don't mind that if someone does it to me - but i prefer to not do it to others :)
(unless i'm tipping someone's comment on my OWN post hahaha)