In GaG, the asker is the one 'seeking help', and he should be thankful to the opinion owner for giving him the most helpful opinion.
But why is it opposite, that the opinion owners are thanking the askers for MHO award?
Most Helpful Girl
Because they gave the opinion owner 10 extra Xper for voting, and their vote adds to their MHO percentage.
I've seen many times where the Opinion Owner will thank and the Asker also thanks for the advice. I think also by awarding the MH it's the Asker's way of thanking them.1
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Most Helpful Guy
There are so many reasons :-
#1. Good manners
#2. Showing appreciation to the Asker
#3. If he/she chose me, it means he/she is really a wise gentleman/lady who doesn't choose dumb answers / validation / friends so, it's my responsibility to behave like one with the right etiquette too.
#4. They selected us, it means they already shown their appreciation and we should thank them for the time and effort they took.
#5. It won't lose us anything but might earn a lot.
Last but not least,
#6. "The first responsibility of a leader is to define reality. The last is to say 'thank you'. In between the two, the leader must become a servant and a debtor." Be a leader 8)