They still had to pay him MLB salary and allow him to acrue MLB service time without finding out anything about his ability to pitch at the MLB level. I really wouldn’t consider that a wise strategy.
Well, I was just laying out the facts there, not really commenting on the wisdom.
Although MLB minimum salary on the 60 day DL is pretty minimal risk. Service time is irrelevant at this point. They're going to get 30+ days to work with him in the minors, and they can easily get 30 days in MLB after rosters expand if they want. Re-evaluate at that point. The biggest cost to them so far was the roster spot from December into February last winter.
I am not terribly confident that Burdi will pan out, but it hasn't cost them much to find out. Considering he's been stashed on the 60-day DL, the real costs are probably not that different from the Twins and, say, John Curtiss.