You must not have visited his witness post, here is a link so you can get a better idea of what the requirements to become a witness are as well as @yunkzilla reasoning for why he wants to be a witness.

Here is an in depth post by @pfunk :

https://steemit.com/steemit-guides/@pfunk/a-full-steemit-user-s-guide-to-steem-witnesses

And here is @yunkzilla's witness post so you can get a better idea about "who" he is:

https://steemit.com/witness-category/@yunkzilla/a-witness-campaign-for-the-people-yunkzilla-would-like-you-to-consider-a-vote-for-change-running-on-yunk

Have a blessed day.

@lexiconical sometimes it can seem silly, but there is still a solid goal for the community. Also witnessing is just to help the blockchain and this platform ultimately. A lot of witnesses don't even have a voice at all doesn't mean that they're not helping all of us in a huge way. We're trying to create more of friendly/fun space where everyone is equal.  We're here to help each other grow, by doing so we all grow together. We also want engaging content even if it's silly. You can have humor on the road of your cause. 

There's a lot more requirements for a witness, such as dedication to the supporting the block chain. They have to pay for a server or acquire one out of pocket. They would have to setup and install the witness on their server and protect it. They have to make sure it's all active. Then they have to find some way to help the community so others can vote for their purpose. They also have to maintain their witness so it stays online. The other witnesses watch them closely so  no one misses a block. 

There's plenty of research you can do @lexiconical to see why we're even all here and how some our just trying to enjoy their time on this platform while helping each other grow.