Well, I wouldn't exactly call them "my market". I don't have the resources to launch a huge BTC promotion in Greece (nor do I have greek contacts), although I am curious; how could you use BTC with an old flip phone?
Also, that would depend on what technology is commonly affordable/available in Greece. Since "not EUR/ECB" is the most appealing feature of BTC for Greeks, delivering the currency to them requires putting it in whatever form is most available to them. I don't even have the slightest clue what greeks commonly use or have.
I'm only interested in that point because it would be nice to see the people of a country outsmart their multi-hierarchal dictators for once, not particularly because I want to profit from the venture.
I agree, it would be helpful, but you'll have to seed the market for it to be meaningful. Incidentally, markets can be big or small as in mass marketing or niche market. They can be high margin or they can generate losses. Markets in the strategic design sense is separate from profits. People can seek profitable markets or narrow their definition to make the market more profitable (i.e., exclude poorer people) A market is just a collection of people who you believe will benefit from your good or service. For programmers it's like a collection of objects, where objects are always people.
When defining a market segment for the purposes of developing new payment systems I look for what is the most accessible, low-cost technology at the POS for both customer and merchant. Avoiding the whole hardware sell, install, train headache. So in the case of Greece solutions may well look more like M-Pesa (9 million people in 3 years. B/c it is a top down authoritarian model. They're being studied at all the top B-schools now) or the mobile solution in Ghana (open source with equal rights to participation for all consumers and all telcos)
Don't assume that b/c those economies are lesser developed that they haven't found a way to exchange value without using the debit and credit card networks, b/c they have and in that sense they are years ahead of the US (ironic isn't it?) Mass market access to mobile payment, elite only access to Visa/MC. The very opposite of the US. In our case we'd replace bank ACH clearing and settlement with BTC clearing and settlement.