This is Australias finest point in technology advancement. We have slaved for years to create the perfect sauce mechanism. One that gives you sauce without mess, but still allows you to get pissed when you can't get the last little bit of tomato sauce left in the container.
They did have these in America for a bit (at least a few places did) but they got rid of them because it takes a bunch more plastic (which means they cost more) and like many posters have said, they don't hold that much (which means people want more of them, again higher cost). There isn't anything special about squeezing the ketchup out, you can do that just as easily with the ketchup packets commonly used in the US. There is also a much better packet out there in some places in the US (dunno if other countries have it) that you can use to dip out of or squeeze (google heinz dip & squeeze). Although there were some lawsuits on that, not sure how that turned out so that could be part of why it hasn't grown in popularity.
PS. Don't get the reference? TF2!
Australian problems...
http://m.stltoday.com/business/local/why-mcdonald-s-won-t-serve-heinz-anymore/article_8983822b-fc09-56cd-b264-982560997ac1.html?mobile_touch=true