Nowdays, the money got so devaluated that they dont really even need to trade back into BSF.
The way corruption works now is the following:
I as a importer, go to my Chinese friend and ask him a quote for 100 pair of shoes, my chinese provider tells me the 100 pair of shoes are worth 1.000 USD, then I create a company in Panama and Quote myself the shoes for 10.000 USD, I use the new quote to request gov an USD sale of 10.000 using official 1:13 rate. Govs aproves it (by using my connections). I pay the gov 130.000 BsF for the 10.000 USD wich are paid to my panama company (they never give the money directly to the company who is trading the usd but they actually pay to the provider, but remember, the provider is myself in panama) then I use 1.000 to actually buy the shoes and 9.000 as profit.
When the shoes finally arrive to venezuela, marketer does the same, hes supose to sell the shoes at the very same rate he purchased so if you got 100 pair of shoes for 10.000 USD that means each pair of shoe is 100 USD right? that means 1.300 Bsf (using 1:13) thats cool right? beacuse even if they stole 9k, at least the final consumer would pay the 1:13 rate.. but guess what, they also have some child company in here, that would buy all the shoes at 1:13 rate and then chain it over and over to the moment you lose track of the sell/purchase chain and then the shoe is sold at 1:1700 rate to the final consumer.
At the end, the merchant ends up selling 1 single pair of shoes for 170.000 BsF that is even more than he needed to pay for the 10.000 usd at start.
Thats how bad it is.
SO yea, as I said it, they dont need to even get BsF anymore, with just 1 time usd exchange they already profit.
And yes there is no real demand for 1700:1 or 2000:1 or w.e u name because is not sustainable for anyone, ofc unless you really really need it, like if you are cashing out all your stuff because you leave the country or if u are like super sick and cant find medicines etc.
But if you think that people is just normal trading at those prices, that just does not happen.
Even tho there is scarcity and a big one, you can still find subsides things, so either people cant afford to pay for expensive items (at black market) or they just complete ignore the need of USD because how expensive it is.