Just wrote a solid investors report, be sure to check it out :)
You can always check current returns by checking @tipU payouts at: https://steemblockexplorer.com/@tipu
One of the last STEEM curation payouts:
tipu send 0.005 STEEM to onufry
Curation rewards payout from @tipU: 0.005 STEEM earned | 0 STEEM auto reinvested | Thank you! 32m ago 8a2cba...
tipu send 0.056 SBD to onufry
Payout from @tipU | Previous payout: 24.0 hours ago | Total @tipU profit: 112.377 SBD | Your current share: 0.03139% | Your profit: 0.056 SBD | Auto reinvested: 0 STEEM, reinvest ratio at 0% | Your investment: 60.0 SP delegated + 0 SP invested out of 191130.979 SP total | Thank you! PS. You can now tell @tipU to make instant payout, more info here: https://steemit.com/steemit/@tipu/tipu-investors-update-payout-on-demand
So as for liquid STEEM payout, today it was 0.005 STEEM for 60 SP delegated - but this value varies from day to day, depending how good were the posts that @tipU upvoted :) I have some systems in place to maximise curation rewards (more voting power for new post, or posts that engage more users) but I'm not quite happy yet.
For example if user uses @tipu to upvote a post, that was already heavily upvoted - the curation reward is very small. But I can counter that and spend little voting power on post that were heavily upvoted before - I'm just not yet sure if it's a good idea (this may discourage vote buyers).
One more thing: please remember that curation reward is paid after 7 days of the post creation (and upvote) - so curation rewards are paid to delegations that are at least 7 days old. Hope that's OK.