There isn't anything stopping me from buying more Steem, but I'd like to give my personal thoughts after reading your post.
I have been buying Steem a little at a time. I thought from the very beginning it was strange that I couldn't buy it through Steemit. If the point is to get more people to invest then it should be easy to do.
If the point is to get investors then I think I'm understanding Steemit better. I thought the concept was to attract people with ideas, things to say, adventures to share; the better the content the better they'd be rewarded. I thought they were the main attraction. Now I'm getting the idea that they're the parsley on a dinner plate, basically irrelevant.
The other communities you're involved with, do you think they are tighter because there are fewer members? Easier to get to know a couple hundred (or so) rather than thousands? Or because they share one common interest?
I agree it's up to us to create communities within Steemit. I see them, I follow them, but other than randomly coming across them I don't know how to find more of them. A centralized list somewhere? I had been tagging my garden-related posts with "garden" finding out later there was an established tag of "gardening". I'm supposed to know that - how?
If posting and commenting and voting is the main thing then it should be easier. But since it's not easier I'm back to thoughts of parsley.