Well, if the theory is that the benefits are for single parents rather than those who are benefiting from the pooled resources of a marriage, in principle, then

Well, if the theory is that the benefits are for single parents rather than those who are benefiting from the pooled resources of a marriage, in principle, then, at the very least, such a benefit claim could be said to go against the spirit in which the benefits are offered. That said, given the absurdity of the situation and the fact that the rules severely punish them for being married, I wouldn't fault them in the slightest for doing exactly that.