Well, it looks like this topic is ending in the shallows of breaking up medal groups, as it has been done for long, long times and still happens.
A relation or collector keeps a group together for sentimental/historical reasons, but as it is in real life, once sold greed or the market takes the upper hand.
Welcome in the world where most people know the price of everyting but value little.
What would you do, boycot these dealers for life, or in the long run buy their stuff because you are a greedy collector?
What's the price of principles?