I brought up population to elucidate the point about the market in Poland being larger in absolute terms (thus correlated to a larger pool). The second comparison I made (per-capita wealth) shows that even if Greece had the same population, Poland would still have a more valuable market. In other words, Greece is screwed in two ways - it has many fewer people (1:3.5 ratio), and even if the populations were equal, Poland would still be more wealthy (albeit only slightly more so).
If you were to strictly talk about countries that were more comparable in terms of population - like Belgium - the per-capita wealth situation becomes more bleak. Belgium is light years ahead of Greece and Poland. Wiki isn't always the best source, but checking there I can see that their per-capita allocation of GDP (nominal) is around 47k vs Greece's 21k (224% higher). This is a massive difference. Just to add to the comparison - if you were to compare Kazakhstan's ratio relative to Greece, you'd see Greece is about 200% higher. In other words....the average purchasing power of a Greek is closer to that of a Kazakhstani than it is to a Belgian.
Now, this is all grossly simplifying the issues at play. The TL;DR to what I'm trying to say is that Greece is screwed both in terms of competitiveness for each potential customer, AND in terms of sheer market size. Long story short: we ain't gettin' a pay day.
-edit- spelling