I agree with Siegi…there are honest and dishonest folks EVERYWHERE. You can get taken for a song trying to buy a hunter horse right here in the US from an agent.
It is also true that the vast majority of breeders in BOTH Europe and the US are small having 1-3 broodmares. I do think in Europe, due to the concentration of horses and structure of the Verbands/ inspections/shows, breeders a much more realistic of their stock. Here in the US everything that hits the ground is “FEI potential”. There they will say “this is a nice foal, but he will not be a superstar”.
Buying horses always comes down to making the right connections and finding an agent or representative you trust. If you cannot find that, buying at the auctions is a relatively safe avenue as well. The Verbands really want happy customers and they are willing to help make the right connections for folks.
Lastly, I do not find it at all “shady” for a trainer/ rider to go to Europe and buy horses in the 10-20K Euro range, take the risk of transporting the horses here, furthering their training and then selling for a higher price (even if that price is significantly higher). That is their business and how they make a living.