https://public.tableau.com/app/profile/ddmrddmr/viz/BitcointalkMeritDashboard/PostSummary
As of last Friday, the overall habit was to award 1 sMerit in 68,94% of the TXs, 2 in 16,95% and 3 in 4,07% of the TXs. The said table displays the rest.
Merit habits may change overtime, depending on multiple factors such as available sMerits, one’s available time, the novelty or recurrence of the posts, the interest of their content, whether one actually understands the content, the mood, and so forth.
Edit: The 50 sMerits per month per receiver is really a running window for the last 30 days, down to the second (I believe). By that I mean that if I give 5 sMerits to an account today, and 45 sMerits in 10 days time, I wouldn’t be able to give that account any more sMerits until after 30 days have gone by from the 5 sMerit TX (5 sMerits at most, until yet another 10 days go by).