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Probably for multiple personal reasons: many probably work aside from being on the forum, and do not find time enough to award all their allowance. Others might be awarding smaller quantities per TX and therefore take longer to finish off their pool if they don’t spot enough meritable posts, and so on.
Awarding should be a simple job in theory, but in practice, I find it more time consuming than one would wish for, especially when you merit a person you’ve never merited before. This is a personal procedure obviously, but I tend to look at the post, check for plagiarism, and review the history to a certain degree. That is quite some time, apart from the one invested in trying to find the post to start with, separating the wheat from the chaff.
In this case they could delegate their unspent smerits to someone else like another trustable merit source for example.
They just have to send them their remain smerits. Some merit sources are complaining they don't get enough smerits to spent (like
The Pharmacist for example), so it can be a win-win deal.
Only
15850 merits have been spent this month by all users. While 22055 merits had been generated for merit sources. The gap is huge.