The main problems with replenishment, however, are that for developers that are not self-replenishing it can be annoying to find the replenisher (you can buy HC-110 at literally hundreds of larger camera stores, but just try finding the replenisher for it!), and unless you develop a lot of film, the developer will still fail due to oxidation in storage because it doesn't get used and replenished often enough to stay ahead of the deterioration of the developing agent(s).
For most amateurs, one-shot developing with dilute developers is the most economic method that gives excellent consistency of results, with two-bath developers in a close second place. And it *is* possible to develop large sheet films economically with dilute developers using any of several methods of minimizing the required amount of liquid (Jobo and such rotary processes, or BTZS type tubes with minimal developer). These methods all require continuous agitation, however, which limits the compensating and speed increasing effect of high dilutions. For my use, I don't think it's excessive to use 8 ounces of HC-110 Dilution G (which contains about 2 ml of syrup) for a 4x5; that much developer has almost enough capacity for three such sheets, but the convenience and consistency of one-shot make it worth using the larger amount of liquid. If it were a big deal, I could easily modify my tube system with cores that would reduce the liquid requirement to 3 ounces, just the minimum for that amount of film. I could just as easily make a tube system that would develop an 8x10 in 12 ounces of liquid (though it might require a bit more adaptation of materials to make the core just the right size).