If you like it, top it.
Like a student who gets a good grade in school is being rewarded, or your sons or daughters who did something nice, like an employee who succeeded in a business project or anyone achieving by virtue of good deeds, leadership or anything valuable, he/she in a way is rewarded.
At APSense, I observed a lot of articles where positive or rather favorable comments are posted underneath. Truly we have a lot of APSense members whose articles are real useful, informative and their way of writing is really that extraordinay. They are very much GIFTED with that talent of ARTICLE WRITING. Their contributions to APSense is remarkable and that it is bringing APSense to a higher level leading to its SUCCESS.
Putting positive comments on good article favors the article and of course the writers themselves. But let's not forget that simple single action of topping it.
If an article is GOOD, and if you like it, don't hesitate to TOP it.