Ahh another starter vs direct pitch thread. I've been up drinking my Citra/Simcoe IPA watching football so I'll bite. Let's see, "I made a great beer and didn't make a starter". "If you made a starter it would have been even better". Does that about sum up the debate?
I too railed against the seemingly religious following starters seemed to have. I made some damn tasty brews without starters and didn't need someone telling me I was doing something wrong. As I've gained experience brewing I've realized both sides of this argument are "right". How can that be you ask? Well, you can make a great beer using either method. It all depends on the variables. The trouble is, as I've learned, is that you never really know for sure how all the variables are going to come together in the final product. Each variable you manipulate as a brewer has the potential to influence the flavor of your beer. That POTENTIAL doesn't mean it WILL influence your beer. Pitching yeast at the rate recommended by MrMalty or YeastCalc is just another variable. As a brewer you have to evaluate which variables are most important to control for the particular batch you are brewing. If you're a dogmatic "I always make a starter" brewer, it may be hard for you to let go of the fact that your 1.045 lawnmower beer would have been just as good direct pitched. If you're firmly against starters, do you really think your 1.090 DIPA will be the best it can be with 100 billion cells? Do you really want to just drop another 7 bucks if you don't? What will you do if 200 billion isn't enough, pitch a 3rd pack?
What's my point? Making a starter is a pretty simple way to increase the quantity of yeast in any form. Entire batches have been brewed from the dregs of a single bottle conditioned beer using multiple starters. A starter is just a tool in a brewers chest. It may make sense in certain situations, and skipped in others. The "argument" will indeed never be settled because there's way too many variables. There's no way to determine the exact cutoff where a certain number of yeast cells in a certain gravity brew will produce an inferior/superior beer. It is fair to say however that that cutoff does exist. It's unique to every batch and strain of yeast, but it's there. At some point of gravity and volume 100 billion cells won't get the job done well and either quit early, produce off flavors or both. If you dispute that, you probably haven't been brewing very long. Keep at it, and you'll learn that starters can be a valuable tool, but you don't have to use it every time....