As John Cleese pointed out (IIRC, as a followup to him making a brilliantly funny and loving eulogy to Graham Chapman - "Good riddance to him, the freeloading bastard, I hope he fries"), you can be serious without being solemn.
You certainly can. Far more often what occurs on the internet is that people are jokey and disruptive without bothering to be brilliantly funny, and we don't need much of that here at all.
We have some cheeky humor here every now and then and my personal opinion is that it's completely fine, but it's usually made in tandem with a serious reply :)
I don't know about you. But me and JBreefer are pretty important people. I for one, provides a nearly 100 mosquitoes every day with vital nutrients from my blood. I don't know what the poor things will do without me.
Pretty sure, (judging by how serious JBreefer is, and how he starts the comment by an emphatic "No"), that he also act as a corner stone of some similar establishment....