Transferred $1000 today @ 213.50 and bought the blue at 198.
Gain of 15500 pesos, or US$78, or 7.8%, in one day (based on the blue rate), for moving your money from one place to another. I don't call that a small profit. And you should be able to transfer a couple thousand dollars without a problem.
And there's something else to consider. It's hard to get dollars to Argentina. It costs significant money to do so. So if you like to have an emergency supply of dollars here, you can save ALL of those costs as well. I calculated that for my situation with my US bank (using actual numbers from my last trip), for me to bring 5000 dollars from Uruguay costs today 9 pesos/dollar. So in addition to the 15.5 pesos per dollar I gained today, I can count another 9 pesos of savings in getting my dollars here.
Not a bad deal at all.
This large spread between WU and the blue is probably a short term phenomenon/opportunity, but you never know. This is Argentina, after all.