Hello Ilana
I would really like your consideration about the project that I am doing at steemhost.com (eg https://steemhost.com/@techslut). Instead of burning steem off it sops it up like a sponge. People buy advertisements using steem but it is distributed back in the form of steem power delegation to people who are visitors to the pages or the "hosts" (you are now a host) who have content featured on the site and select advertisements to appear on the pages.
As an example:

This particular advertisement has been assigned a 0.01 payment if viewed and a 0.02 payment if the visitor clicks on it. A total of 6 steem was paid and there is 2.59 remaining payout balance. This is not rewarded in steem or steem dollars. This is rewarded as steem power delegation.

Our bot does the delegation once per day. So far over over 40 steem has been Powered Up and 15 steem has been Delegated away.
Aside from initial teething pains, I can see one stumbling block to deal with. There is nothing to prevent me from cancelling all the delations (taking one week), powering down, (13 weeks) and escaping to some tropical island (slowest robbery in history). I have a solution for this which could be something the steem design team could consider in the future. That would be to have the option to put a quantity of Steem Power into "trust". It could be delegated but could not be powered down. I will post about this in greater detail later.
Aside from using steemconnect to authenticate users (whether as visitors or hosts) we have no need for posting (or other) keys on the steemhost site.
I hope you can give what we are doing over at steemhost some consideration and make any suggestions as necessary.