Interesting concept. You know, there are some folks out there who do this not with just 1-gallon batches, but 5 gallons -- keep on brewing the same recipe, using the same yeast cake over and over. Personally I think any repetitive small-batch brewing such as this is an excellent opportunity to tweak the recipe a bit, to where you would in fact be able to drink some of the first batch or two, figure out if there's anything you need to improve upon, and by the time you get to batches #3, 4, 5, etc., you're getting a lot of experience and making a pretty dang awesome recipe -- all in the span of a month or two. Maybe the first batch missed the mark pretty badly, maybe the second batch is a little better, maybe the third or fourth batch you royally screwed up and had to dump it, but by the fifth batch, boy oh boy...... I do find it intriguing. And yes, there certainly are things like leaving a little batch on the back burner of your stove that make small batch brewing a LOT easier. If that's what works for you... more power to you!