That's a leap. You think that spammers are not knowing which spam is silently dropped is the one thing that's keeping them from leveling up? I strongly disagre

That's a leap. You think that spammers are not knowing which spam is silently dropped is the one thing that's keeping them from leveling up? I strongly disagree. Even if that were the case, in my experience, silent failure negatively affects actual delivery much more than any positive effect it might have.