[monksy]

I think it should only be used to get back into your host country. When I'm travelling part of the nice thing of going there is to get a stamp in your passport.

[saryant]

Stamps are going away. Lots of countries no longer stamp passports, at least in some situations. Hong Kong, New Zealand, Australia, Canada, South Korea. The US will generally not stamp their own passports.

Frankly, I'm fine with it now that the US no longer lets you add pages to an existing passport.

[dawnerd]

I must be lucky? but I never get any stamps. Then again I'm never asked more than a few basic questions.

[KSS42]

You can choose to go through the long line, talk to an agent and get a stamp.