They sell well because you can pick them up on the way back from your holidays and tell the folks you give them to that "there wasn't really anything we saw on our holidays that you might like"
They've just come back from the US, Dubai, Australia etc but the cheap cnuts couldn't be ars3d getting you anything you might actually want so the consolation prize is a giant bar of chocolate with bits in it. It just screams out "we are cheap bast*rds and you are only worth the fiver this costs". I get them regularly from my in-laws.