I was responding to the proposed 100% SP. We probably crossed signals a bit there.

The 50/50 doesn't really bother me as I see that the SP portion could be viewed as bonus points or as analogous to a portion of compensation employees may receive in company stock (though 50% would be high). However, even then I see merit in the position advocated by @riverhead and others that we should just let authors and users be authors and users, pay in liquid coins (ideally stable ones) and leave the longer-term investing and risk-taking to those who actually want to do that (of course there can be overlap).

As for Steem posting being a "free roll" that doesn't exactly fit with the idea of subjective proof of work or that those rewarded are paid for contributions that voters consider valuable. That sounds to me a lot like being paid to do a job, or selling a service, or something along those lines.