The advantage of working with a site like MakeMeHeal as an affiliate is not only the generous 20% commission they offer, but the credibility they have with both site users and Google. Linking to that site as an affiliate would likely be seen in a more favorite light. The product and service selection can't really be beat by anyone. I'm not into that industry or niche, but a quick search on Google and you'll likely come to the same conclusion. Your site visitors will also likely have already heard of MakeMeHeal, so the trust factor is already established.