Greece prob shouldn't be included but who cares? It's just a fancy exhibition with some points & prize money and mostly just a preparation for the Aussie Open for the top players.
It's also an incredible opportunity for these lower-ranked guys from Greece and Austria or other countries with 2nd best players who are outside top 100 to take on bigger names in the sport and see how their games matches up to theirs, and a great learning experience regardless of what happens. It's nice seeing new names and underdogs fighting for their country, much like in DC.
For these guys it's a once in a lifetime opportunity thanks to this format and event, so just enjoy it instead of complaining about who should and shouldn't be entered. In the past, this tournament didn't even exist and it was always the same old traditional-type of tournaments that took place during the same week.