Contedracula,
I worked as a Finance Manager for an imports / exports company so I am quite aware of this from a very practical perspective as well. I order a ton of stuff, both from Germany and the US for my hobby and everything depends on pricing. I use MyUS.com to consolidated my stuff and send it over to Cyprus.
This is not something controversial - it is a known fact that retailers in Europe sell at substantially higher prices than their US counterparts. Take the PST now at $599 = EUR 800 in my hands Vs prices of EUR 995 anywhere in Europe. There's your 25%!!!
However in this particular instance, the prices are set right and I complement both Agema and Astroshop for this. Based on cost of shipping from the US to Europe and the taxes involved, with current prices it comes as follows if I tried to bring a scope to my door Vs prices from Astroshop:
130mm $ 5,900 -> EUR 7,250 Vs Astroshop: EUR 7,210 + shipping
150mm $ 9,200 -> EUR 11,250 Vs Astroshop: EUR 11,060 + shipping
180mm $16,500 -> EUR 20,000 Vs Astroshop: EUR 19,580 + shipping
So, more or less comes to the same and I would definitely go through Astroshop as they are obligated by law to provide 24 months guarantee, plus on any purchase one makes through the internet in Europe, you have the right to send the product back for no reason if you ship it within two weeks and pay the cost to send it back.
I see no reason why I would have to purchase directly from Agema. It's not some noob who is designing the lenses, but a proven optical designer and I am sure they will provide the same sales and after sales service through Astroshop as they would directly themselves.
EDIT: to clarify my last sentence. I see no reason to purchase directly from Agema GIVEN the correct pricing and the lack of a benefit in buying directly.