If anything is causing difficult sales it is the lack of marketing, the relative difficulty to obtain/find copies and finally the relatively difficult payment opions.
In the days of credit cards and Paypal, Amazon.com etc people tend to give up easily when they need to cross so many hurdles, besides the language and a weak US currency value.
No this isn't a critique, but even if taken as such it is only meant in a constructive way.
1. more exposure & links (look at Christer Bergström, he's all over the place promoting his books!!)
2. more payment methods - at least Paypal (relatively cheap method to enable anyone to accept International Credit Card payments!)
If it were some esoteric subject, but it is Jagdgeschwader 52! Also the language is a small barrier, since the photographs and tables alone make it a valuable asset.
Honestly I really don't believe there is any reason why the JG 52 books should not roll out like so many hot rolls and sell out within a short time span. The internet has changed the way you can access a niche market dramatically.
Look at this forum, just one of many.
It takes but one post, with all the book and sales details, in the
On Offer section. Even if you only catch a few customer's that way, it is a free means of getting exposure.
In this case I'd even make it a sticky post.
