Captain N. Tenneal
Member
You can straight up buy Tranquilizer, too, which makes that a lot easier than using the farm. You only ever need two or three tranqs for a capture anyway, so it's not like you need to have a bountiful surplus.
By the time I was finishing up with Tri, I was capturing every monster. Not only does it save you the trouble of dealing with potential injuries/faints as a result of the monster's more desperate lashing out to save itself, but it results in better loot. I only ever killed monsters when I was playing with more exuberant players who didn't understand how or why to cap.
Eventually you'll need a lot of tranquilizer. However, by that point, cash should be flowing pretty freely.