When you will actively participate in discussions, you will be visible to others. When you give positive contribution, people will know you and appreciate your work. You don't need some points for appreciation or a post to make to say I appreciate it.
The reason for introducing merit was to filter spammers quickly from people who are at-least giving some efforts in their writing. I am not going to say it worked very well, there are farmers who are always trying to abuse merit to rank up. However with abusing merit you can not continue much far. There maybe some exceptions but the people who made to at-least Sr and above, a lot of them contributed well to achieve it. Without merit these members would still rank up because of their contributions.