There are probably a ton of variables that can get you confused as to wether or not you need them, or it warrants them.

Simply put, you could stock 2 dozen FHM and give them enough time, will become tens of thousands, or millions? You cant get that kind of return anywhere else. Initial 5.00, and get enough feed for other fish that if you had to replace with pellets would be ... wow.

I think some info that others will need to give you an accurate answer are;
What is your stocking schedule?
What are you going to stock?