Hmmm... equally spacing out super bumps over the course of the month seems to result in a lower total bumping effect than e.g. sending a bunch of superbumps in one day, waiting 30 days and 1 minute, and doing it again.
By "effect" I meant "total bump score contributed to good topics". By that measure, your two scenarios are equal assuming the same set of superbumps.
If your goal is to be able to occasionally try to ensure - with highest probability - that some topics are at the top for
a few specific days (before your contribution decays), rationing like that could make sense. On the other hand, if your goal is to try to continuously keep some topics as high as possible, you would
want to spread it out as evenly as possible due to decay.
But really, people should just superbump good topics whenever they think to do so, and not worry about this sort of strategizing.