Invest? is it ever open to the public?
But I share your concerns as I have the same questions in mind. But there is still a risk of microblogging on Steem that you might overlook. Let me share a little experience and you will understand ...

I went to Europe for travelling a while ago. And before I left, I was enjoying quite some automatic upvotes from big fishes. I have been conscious about my posting frequency but before I left, I hoped to "clear my stocks" so I can blog about Europe without photos-to-share piling up in my files. Maybe that's how I lost @gavvet's vote (my guess only), the biggest one at that time. I may had posted a little bit too many (like 5 posts in 2 days, something like that) for the bot to consider me 'spammy'...

So, you see? even now the blockchain does not punish you for over posting, the criteria of some big voters might consider you spammy and drop you off the list... Unless they add more conditions to the filter, but that's up to the voters to decide. So, even you just want to write a memo for yourself, the blockchain will tell the whole world: exyle just submit a POST!! FYI my friend! :) p.s. I am pretty optimistic about losing big votes though... It gives me incentive to write better and attract votes from many others out there. I don't like those who whine after they lose big votes like they deserve them. It's a free world! :)