Merit created to prevent this kind of member and only shitposter are leaving this forum just because of Merit system. If you feel there are no chance for you to rank up, you can cheat the merit system if you want to, but I think you know the consequences of it 
They are not leaving (I guess), they are trying to cheat the merit system. Small part of them are trying to adapt by improving themselves to be better, more constructive. I think those users who changed this way are good for the forum, though they were spammers, shit-posters in the past. However, if they can change to be constructive users, it's good; then we can call them as ex-shit-posters, lol.