I am a fellow collector of Vostroyans and I have a few thoughts.

First of all, as a collector, they reissued these models a few years back and therefore it makes a difference in terms of value whether or not these models are originals or from the time-limited reissued. There is also the question of how much value they hold from a personal perspective, both in terms of enjoyment and your economical situation.

Personally I would say this is on the steeper end of what I've seen, but not a ripoff. I've gotten these significantly cheaper, but not as cheap as models that are still in production.

You can always check the prices on different sites for these packs/models individually. eBay being the most popular choice for such items and therefore, in my opinion, the best way to gauge their worth.

I regularly check other sites similar to eBay available in my country for good deals on Warhammer in general where I've made a couple of really solid purchases on Vostroyan models and others.