Jonathan,
Thank you for taking the time and effort to come up with those figures. I must confess that the overall numbers are somewhat higher then I thought, due to certain campaigns having much higher completion rates then the majority of campaigns.
Still, the completion rate is no where what it should be. Such factors as needed to move on to another campaign, finish up a previous campaign build, loss of interest in the model, or just screwed up the build. The fact is that most just don't finish what they start because we have multiple builds going at the same time, and loose their focus for that build. As have been pointed out numerous times, I'm the exception to that rule, as I only start one build, and it goes to completion before I start the next build. I do my research, kit inspection, AM ordering well in advance as a break from the current build. But for me, focusing on one build is how my completion rate is well over 90%. In the last two years I've started and put down just one model with maybe two days work into it: The Special Hobbies 1/48 scale Buffalo. Just couldn't get my Mojo up for it.
I've been building models on and off longer then most just because at 67 I've been around longer. I tend to work a min of 4 days per week, with a lot of 5 day weeks as the temps drop outside. Usually my work sessions last a min of 4 hours. So I do put in my time. And I realize that my chosen scale; 1/48 takes longer to complete a model then a typical 1/72 scale OOB build. But to assume that the average modeler can complete two models per month is pushing it somewhat. One completed 1/72 scale model per month over an extended period would be higher then the norm. Personally, my builds are semi OOB/detailed, and I average around 3 months give or take a few weeks. the A-6E took more then 4 months, while the P-38 will be done in 6 weeks.
Bryan's concept of what a campaign is, really isn't what they're about. His description is more attuned to what Aeroscale is all about. A campaign is a small microcosm of a SIG. Where a specific subject matter is what all the members/builds focus on. There is a time frame 6-12 months to complete ones model(s), and receive a campaign ribbon for it. And yes, it's also a place to gather and share a common interest in a subject, but that same concept is done all the time in Build Blogs.
Personally, I've never visited, or viewed any models in a campaign that I wasn't enlisted in. It's far to difficult to follow a build over several months as there isn't a logical way to do so. But a Build Blog is offers you easy following, and a continuous give and take from other members who share your interest in the subject matter, and or build.
As I said in my 1st post, in this case, less is far better then more, as I think that Jonathan's figures more then prove that point.
Joel