Farming yeast for a while would also increase self-reliance if you're into that kind of thing. I like being able to do stuff without having to depend 100% on a HBS, maybe just like 90%
Depending on how many batches you make, you can save a good bit of money, considering what a half decent vial of liquid yeast goes for. I pitched a starter last night in a borosilicate Erlenmeyer flask, and it's going quite strongly. I intend to divide it a couple of times and reuse x number of times if I can keep the culture strong. (I haven't reused beer yeast before in this fashion). You just have to be really careful about sanitation...the more that you split up the yeast, the more opportunity that there is to get an infection! If there's any significant doubt, pitch the yeast...in the garbage can.