ye this is a pretty common practice, in fact, this is mainly the reason of why we have such high inflacion (because there is people, who, of course are gov related but also anti-gov, who only care to make free money from exchange corruption and they have alot of intentions to keep this going on).. also there is a 3000$ allowance to expend in travels wich you pay at 11 Bsf per USD, wich made a huge business for your average joe people since you pay the gov 33k Bsf but once you "cheat" the system, you get a return of 270k BsF after paying the gov. This is the major reason of all those flights problems in our country, because in order to get this 3000$ quota, you need to buy a plane ticket, airlines also want their cut on the huge bussiness so they sell overpriced tickets that people who will "cheat" will still buy, also note that the "big debt" that the gov has with the airlines is because when airlines sell a plane ticket in BsF they take the 100 Bsf Per USD rate, but then they expect the gov turns all those BsF into USD at official 6,3 rate, thus the gov "owes" the airlines billions of billions.
Anyways this is just a resume to see how everything is related, anyways as alot of people says here, bitcoin wont help at all.
Sorry for mistakes in english . :)
Edit: BsF = Bolivar