How will you stop cricketers prioritising IPL over playing for their country?

Here is something to ponder:

Cricket has always been run on national lines, and appearing for one's country is the chief aspiration of almost every player. How far, though, does playing for, say, New Zealand or West Indies remain your absolute priority if the bulk of your income instead comes from a city franchise in India? What happens then to national teams, and, by extension, to test cricket as a whole?

Consider this in light of the fact that both Symonds and Hayden have expressed their unwillingness to tour Pakistan due to safety concerns. Intriguingly, the security team appointed by the CA is yet to visit Pakistan. So what made them state their unwillingness?

Keep in mind, if the Pakistan tour is deemed safe both Symonds and Hayden miss out on the first two weeks of the IPL, which in turn means that they lose out on their two weeks pay.

So how will you judge these players and or their announcements? Additionally, what if another player cries off from a tour citing personal reasons only to be found willing to play in the IPL two weeks later? Are the cricket boards equipped to deal with this truancy?