I liked the idea proposed by Hive account@craig-grant. Perhaps something like a 3 post limit per day for newbie accounts.

https://steemit.com/cryptocurrency/@craig-grant/cryptocurrency-mid-day-report-by-craig-grant-july-20-2016#@proto/re-craig-grant-cryptocurrency-mid-day-report-by-craig-grant-july-20-2016-20160720t183646846z