That's a false proposition, isn't it? Everyone is not going to offer his services. It's going to happen on occasion, and it's usually useful when it does happen.
If it ever did rise to the level of spam, then HN already has a mechanism for dealing with it. But it's nowhere near there.
Offering services (e.g. SEO) gives occasion for interesting discussions on topics as well. This is certainly useful for the community.
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But if everyone posted "Offer HN" posts
That's a false proposition, isn't it? Everyone is not going to offer his services. It's going to happen on occasion, and it's usually useful when it does happen.
If it ever did rise to the level of spam, then HN already has a mechanism for dealing with it. But it's nowhere near there.
Offering services (e.g. SEO) gives occasion for interesting discussions on topics as well. This is certainly useful for the community.