Most people are sending the smerits they have to posts, only few people are hoarding smerits. Some of them are not very active on this forum than to see some questions and answer them.
Or do you mean that there are some merit sources that are hoarding smerits? You can report them to theymos if you notice that. Theymos will likely reduce their merit allocation or remove them. Theymos like merit source who makes use of the smerits he is sending them.
He/she was talking about users who are not merit sources but have enough smerits and they decide to hold onto it instead of sending it out which is a normal thing every user of this forum who's not a merit source can do since they can independently decide what to do with their smerit since they are not merit source.
This is why I don't see any usefulness in the topic raised by the OP.