well, in Wrestling they have a tradition in "buying" (better, taking advantage of their decisions...because I don't think they actually bought those athletes in the same way Azerbaijan, Qatar etc. - just to make an example - do) and not only in selling talents...
remember the lights of the Nazarian, Moureiko, Guri...all of them winning global medals for Bulgaria, but coming from different Countries...
by the way, we live in a global world, so to me it's quite normal to see athletes travelling to find better chances, like any other people do...
the only thing that sports officials should do is avoiding - no matter how - shameful situations like those of Azerbaijan, Turkey and/or the Gulf Countries (and Greece in the past, nowadays I don't think they are a "threat" in that sense anymore)...