I can see how it might appear to be that way. For the record I have no relationship with Sucuri whatsoever. I do however know that they engage in WordPress cleanups and (from what I've heard independently but YMMV) they're rather good at their job. That's why I asked because sucuri submitted the post - I'd rather the HN community got a good deal and I asked the question than people paid over the odds when they could've got something better.

I can see how it looks like a pitch, but in some ways it's an anti-pitch or a pre-negotiation. They specialise in wordpress compromises, we deal with completely different stuff but in the security space. We can deal with your compromised wordpress install but sucuri does this day in day out - we deal more with your network being broken into. I thought it might be good to highlight the poster's speciality in the area, and (cheekily) ask for a HN discount.

Apologies if I've betrayed some HN etiquette here, that was not my intention. For What It's Worth I'll be talking tomorrow at OWASP London about WordPress Security and (again, independently) recommending Sucuri's scanner - it's better than Plecost, not by much, but enough.