They can escape the shackles of Constantinople which is paranoid about them getting too powerful for their liking. If they are magnates in Vlachia, they are basically kings on their land. Besides, Constantinople is close enough for more than a few trips every year so they can soak up all the plays and chariot races they can fit into their itinerary. They still can maintain a secondary abode in the city before retiring back to their primary Vlach residence for the rest of the year. I mean, even a magnate in Armenia will have reason to visit the capital each year, but that doesn't preclude holding on to his far-flung holdings. If not for long term residence, it could still serve well as an investment. Nevertheless, the magnates could just be huge nature buffs and disdain all the hustle and bustle associated with urban living. I hear the Carpathians are lovely this time of the year.Ah, they could do that. Why would they do such a thing though? Vlachia's the Ruritania of the Orthodox world, a forgotten land of unwashed peasants and illiteracy. There's no culture there for a Roman retiree to enjoy.