Hello,
I totally agree that spammers and account farmers, alt-accounts should be controled, prevented to rank up, and should be banned if seriously abused/ violated the forum rules.
However, I don't agree that we should have merit give-away contests for reporting merit abusers officially like your suggestion.
Why?
Those sort of contests will contribute to create a new generation of un-knowledgeable users, who mainly or simply focus on screening to find abusers. Instead, they should do both: screening abusers and learning knowledge.
I don't deny the fact that screening abusers are good stuffs, but it is not good if they only focus on this tasks (I use the word 'task' because they might do this due to there are available merit-give-away contests for finding merit-abusers. Users like this are merit beggars, nothing more.
Just my opinion, so let's take it easy if you don't agree with my stance!
Someone like this guy:
https://bitcointalksearch.org/user/1993jochico-1807652His main tasks in the forum is reporting merit abusers
Edited:One more case study:
https://bitcointalksearch.org/user/xal0lex-1068464This guy posted most of his threads in Russian board. I don't know Russian, so I can not verify his thread quality but maybe low quality. Small part of his threads written in English mostly focus on reporting merit abusers (in fact, he did almost the same in Russian local board).