I read in an update post that Haremette drop rate is tied to boss level, and since Dark Lord has one of the lowest max levels he's also the one with the lowest drop rate.

Last event i had to clock something like 1k on him to get the girl, so when Levitya got put in i already had a feeling it'd be an exercise in futility. Wouldn't you know... still nothing.

Spending gold on refills would be just throwing money into a dark pit really, virtually no cash payoff either.