I've gone the 'not skinflint' route this year. Basically buying cans of "Propper Starter" and just using those. Only downside I've found is you are locked into making 1L increment starters. Not really that big a deal. I DO like how I no longer need to worry about buying DME, boiling it, cooling it, and then getting it on the stirplate. Now I just pop a can, add 16oz of water to that, and it's off to the races.
Since my LHBS carries the canned starter wort, it's an easy route to take. Typically grabbing a 4-pack when I'm there getting supplies and know I don't have enough cans for the coming batch.
I had thought about reserving wort from a batch. But I try to keep my volumes as close to what I need for the batch of beer as possible. Not adding extra volume, that I'll have to either pull off before going into the fermenter, or figure out another way. More hassle than it's worth, for me at least. Not to mention, I'd want to pull the wort for the next starter from before adding hops. Adds another layer of crap that I find no value in. Maybe if/when getting either canned starter wort, or DME, is difficult, I'll consider it. But right now, it's simply not worth the effort.