Hi Norbert,
I look through your whole catalog of models and there are some very interesting one, particularly those relating to animals and nature landscape. For the rest of the models, there are plenty of decorative models. What I notice also is that a lot of models are offered in 3 versions, one plain and 2 with different carving region around the subject. To me, I would just get the plain version and add the carving region around the subject myself. I'm just pointing this out because that reduces the number of actual unique models in your catalog.
As for the cost, even if I downloaded only 50 models from your catalog, which is the number of models I would be interested in getting, that would still be a good deal ($5.50 per model).
Since a subscription last one year, how about the possibility to monthly payments? $275 in 12 payments would be about $23 per month. Less of a hit on the wallet.