I agree on parts of your points and as I pointed out in my latest blog post, Steemit itself has possible tools to balance those kinds of things.
Nevertheless, you have to see Steemit differently.
I'd more advertise it like this:
- On the long term, quality content eventually will get you money.
Since, on the short term stupid memes might bit you out, but after you build a certain followership you will grow with them.
I would like to point out 2 things here.
a) It is definitely worth investing in SP, since it gives you back through curation (which is probably more than what you get at your bank at the moment) and you are able to grow with the price of steem, which might get you some extra $.
b) It is like opening your own blog, at the beginning, even if you post a lot of good content, it might not get you rewarded, but as you grow and continue to post good and interesting content you will.
And the chance of this happening in Steem is 1000 higher than in a regular blog.