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I will try to answer your question following some guesses:
-Bidding rounds give an average of +5% ROI for the bidder after the 14% curation.
-An average of 14% curation rewards.

Earnings for 20k Steem Power


100% profit


It would give an average of 18-20 SBD or Steem (distributed among both) per day.

Curation reward bonus for largest sponsor


With your 20k Steem the bot would have around 21200 SP (the more people delegate the more you would earn if you are still the largest sponsor) meaning it would get in curation rewards roughly 2 Steem per day so you would receive 2.1 extra Steem every week.
PS:
This numbers are highly likely to change due to:
-Steem Price
-Bidding rounds (How much people bid, the more people know the bot the more that it will earn)
-Curation rewards(We have a 30 min post age

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