Main reason is because I don't have time for it. Since I own and manage several businesses (and new startups are being added constantly), time is something that I don't have very much.
For 2019 I'm launching dozens new startups (with some other partners, none of them is not 100% mine). And in total I have set a goal to raise a business to higher level and income. My main goal is to reach the 55mil euros per month income, and spend it all on charities and employing some serious number of people.

Although, there are several smaller reasons why I have never been serious with steemit:
I have zero trust in the founders (I think they are very greedy and don't really bring a value, just fake it), not enough quality content (most people "force" their posts just to get rewards-no real value behind it, I don't like platforms where users make money from users who use it to make money...with that system it looks something like a Ponzi scheme, too many bots that usually ruin everything, and so on.

Just because I won't be active on stemit, it doesn't mean we can't connect and talk on other platforms. For example, you can always reach me on skype, viber, linkedin, twitter, sometimes facebook...
If you are active on any of them, we can talk about potential business partnership there, since everything posted here in comments is public...you never know who might see it and take some idea of it...