More Permanent Items

It speeds up training because you don't have to stand around to pick up each drop that you want. It's more of a time saving factor than a money saving factor. I do think my pet picks up more than 20m mesos in 3 months of training, though.

By drops, do you mean like uncommon stuff or things like ores? Because if it's not worth it, just use the nx you would have spent on a magnet/pouch on MTS mesos and ignore all the regular junk stuff drops.

The meso magnet kind of depends on how much you train though because you don't get a whole lot of meso drops other than from training or farming for things like time pieces.