Absolutley they know, there are actually ration cards for pork but as far as others whom are probably getting it from the base black market it is best to keep things toned down and not insult the intelligence of the hosts. Plus it is a good way to get your friends arrested or deported if they are re-selling it.
As you know there are some extremely naive and gullible people on here and they seem to forget anyone with access to the internet can read all the posts on here, that includes US Secutity Forces, Qatari Customs, Qatari Criminal Investigationsand Qtel Security.

Do'nt look a gift horse in the mouth.