Exactly. They have incentive in accepting any possible ridiculous patent (money) and they do not take any legal risks accepting these bogus patents (can you sue them if you can prove the patent was bogus ? short answer: NO). Why on earth would they become "ethical" and "good" (and other kind of nonsensical adjectives) and refuse the money people want to give them ? It's like asking a prostitute not to accept money based on a client reputation.