I do see things a little differently, as a small developer. I came to this as a simmer, and I suspect that most developers did. Sure, for most, it is a business, and we live - or die - by business principles, but it isn't a great way to make money. I could make a steadier income flipping burgers, although I wouldn't. I do this because the local community benefits, and for a long time I've been part of the local community. Luckily a lot of my customers see that, and are happy to support me when times are tough. At the moment I'm in a similar position to Flightbeam, although without the great catalogue and reputation. There are not a lot of developers doing local scenery, so it has turned into a relationship which is less like a business/customer and more like different roles in the same community.
As a single developer, it is inevitable that I go broke very soon, but that won't stop me, and it won't be the first time. I'll do this until I can't any more, and I'm resigned to being poor but happy. I like what I do. I would be surprised if most developers weren't in the same position, give or take a few thousand dollars.
I do think that it's too early to make a decision on how to charge for addons for the new sim. But it won't take long once the SDK is released. In the meantime, give some thought to supporting your local developer!