Why to report when you can post and get paid for it? But now when topic is trashed by mods, it means that these users just wasted their time to make these posts .
I have to admit that I'm quite lazy to report shitposts and similar stuff. But when I see someone posting referral links, I report it immediately. As said above, it's easy way to increase count of reports .

You don't have to apologize for it. If someone got offended because of this, it's their fault.