I guess if the post is really deserving it is not an abused of the system anyhow in my personal opinion if I was going to merit somebody if I see he gain more than 100 merits already to his post I won't add anymore I will give it to other deserving persons who need it.
Yes, I think you can really see point with me. People make good post that deserves to be merited but once you come across such post that normally you think it need to be merit but occasionally the post already has a good merit I think no need to add more to it they are more other way to acknowledge a post aside from merit. You can drop a recommendation that will make the poster feel good as well just like those comments above it help the poster know better and give him more understanding about What he/she was taking about because no man knows all whati think is perfect might just be as normal to you.
Am really glad with different opinions shared in the post and know I have learned something new from it.