Not everyone hates them. I have loads of them. But in truth, they do breed pretty quickly and can become too much. Netting them out in the evening is easy enough to control the numbers. Selling them on is not that easy though, there is not much of a market.
MTS are fabulous at turning over the substrate as they bury down in it during the day and come back out at night. My substrate is a type of black sandy 'soil' and the MTS stop it becoming compacted. They also don't damage live plants like pond snails. I don't have a single damaged leaf.
So on balance I give the thumbs up for the much maligned MTS
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