I am happy for your purchase in Greece. You are indeed right about the land. However if property is for five years hold than land is atleast for twenty years.
Land is ok, if you have cash floating aroud which you do not need and you wish to something for your children/grandchildren, university fee or a nest egg for their wedding etc.
Banks will not be very willing to lend on it, so you have to service this. I have a few friends who have subcontracted their land for farming purposes etc. The only benefit is a few eggs/grapes.corn etc.
If you are into buying land. Buy in Transalvania ( Romania for get it for 30years) present cost lesss than a € M2.