Well, I think owning a couple hundred preferreds will almost guaranteeably land you with some sort of profit.
I'd also guess that because you're asking people who are likely going to agree with investing in preferreds that at least a part of you really wants to add them as a hedge. So I'd listen to that message if it's true.
I obviously don't want to decide for you, but I'm mostly invested in preferreds, so take that for what it's worth!