Mike sorry to hear about the BS. I'm no small business owner, but I'd simply raise the price. Like you said, it's only an oil line kit.
Shit, I was elated when I ran across BNR and the prices of his turbos. To see that I could buy a bigger turbo, that is rebuild able, from a reputable guy, for about $500 less than the replacement VF-46...it's a no brainer that I'd want to protect it for a bit more. I'm surprised that Brian does not sell them straight up with a turbo for a Subaru, price included.
I read the post about the packaging and in all honest that was from someone who you could not please if you gave them the parts for free, cause you did not install them for him. I'll order one from your next batch and take a load of pictures, do a detailed write up, and if it fancies you, you can post a pdf of the whole thing on your site next to the kit.