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I'm not going to go into the DA vs. PA issue. What I am going to do is focus on the issue Umar brings up.  That's much more of a concern than the "Science" of DA vs PA since those are really only a tiny consideration across a much broader number of ranking, authority, quality, relevance and trust factors for links from one site to another and not something you would even be able to figure out if you thought it mattered. The risk of cross-linking the way you described on the other hand, is something that could risk both sites being penalized.  How much is the deal worth when considering what the harm would be if either, or both sites were penalized? Gamble if you want. Just recognize the price paid for gambling that gets snagged in Google's spam trap.