Today's employee is tomorrow's competitor.
Do we really want to open the door of our industry to an army of eastern european workers who will happy to earn half what we earn? It won't take them long to realise they dont need to be employed, and can easily go-it alone, charge less and still be better off. Imagine how quickly word will spread in their community.
And all because they learned how easy it was to earn good money by being employed by someone for a year.
Very dangerous road to go down if you ask me, not just for you but for us all.
(and btw, nobody could blame eastern europeans for this, if I was polish I would do exactly the same.)