You'll get a good inoculation of the micro flora and fauna too, what your worms need to process the food you give them. Your kit contains a hook-like tool for managing the box and a really simple set of instructions.
If you ordered just the worms from some supplier somewhere you'd get all one age and size without any of the micro organisms that they need. On top of that, you'd have to pay between $25 and $35 and still have to figure out what to do with them.
You can get the whole kit with everything you need for only $45 plus about $10 shipping. You'll get a bill through PayPal.
Yeah, raising worms is fun. You'll be glad.
I can send you a light weight, easy to handle, lidded container. There'll be more than a thousand worms in a wide range of developmental stages from egg cases and tiny wormlets to the mature breeding size. I'll give you plenty of bedding to start them.