Take a look at merit history of  oceanriver

Here is the list of recent merits this user has received.
(All of merited posts have been deleted.)

44 from skysblu
50 from buyinbtc
16 from rekinthis
7 from fravia
2 from universe_
3 from ontrackk
2 from funbarrel
3 from fireball4
3 from coin_gambler
4 from Nimbulan
3 from useless4
2 from purebitco
2 from angryswamp
5 from potatopower
4 from takingthis4

Then oceanriver has sent back 50 of smerits to skysblu
skysblu has also received 42 merit from buyinbtc

The abuser thinks that there is no way to track merits if he deletes merited posts.

Notice to IDs of these accounts and see how close they are.
88178, 198181, 547405, 547412, 547602, 548943, 548945, 552972, 552974, 552978, 552983, 552985, 553235, 553238, 553242, 553575.

All of these accounts have one owner.
Not only these accounts are abusing merit system, but also they are abusing Yobit campaign. All of them are wearing Yobit's signature.