DPR's: What am I missing?

So DPR's, or Diversified Payment Rights, are pretty new to me. I understand the basic mechanics, and I've gotten some background on historical transactions. I'm just fairly skeptical; I wanna know if there's a risk I'm not considering. I understand there's risk that remittances, exports, or tourism may drop in the relevant country where the bank is most prevalent, but I'm still just wondering why something that supposedly isn't going to go sub-30X coverage and has a very good ECF sweep would warrant a HY rating and price.