First of all I want to sincerely congratulate 
The contest is in commemoration of his 100 days on hive. Woot woot... 10 people will win 10 hive each. That's interesting, we have few hours to the contest deadline but you can still chip in an entry.
Now that's the big question and the topic for the contest. People have various reasons for being on this platfrom, but in order to discover my own reasons... Do stick around.
To Blog/Improve On my Writing Skills
I haven't always been a writer you know, I had to grow in it. 
To Have An extra Side Gig
The general economy level and standard of living have really inflated over time. It litterally had to survive on just a single source of income( except the pay is really good). For those that their monthly pay isn't sustainable, they must look for side gigs. Hive, just like the other platfroms is life saving. The extra bucks I make here sure help in a million ways, it might not be much but it's highly appreciated.
The Give and Take Reason
We all know that no man is an island and therefore we must learn from each other. My niche is more of art and each time I make a post, I try to list out the materials and softwares I used for my designs/drawings and a step by step guide for anyone who is still a beginner in that field. I am Giving out what I know and by reading other people's stories and experiences.... I get to TAKE too
To Network
I doubt that there are people in this age, who do not know the importance of networking. Through Hiving, I am able to connect to a large audience both experienced and noobs in the art field, I get to connect and make friends with them, they leave constructive feedbacks on my post, I make friends and also increase my customerbase to a certain percentage. There are chances of people recommending me for a particular tasks and work, since they have been connecting with me.
Since I began my Hiving Journey, I have really benefitted from it on different levels. And I am really elated to be part of the Hive Blockchain platfrom.