It's always felt as if HN members not only should, but as a rule do, submit links they've found of interest or value. If a member merely and repeatedly submits their own commercial project(s), it feels out of alignment with the spirit of the site.

More explicit rules or code (like limiting the frequency of submissions from a given member to the same domain name, etc) may not be necessary, as the voting system generally seems to work quite well. Or perhaps such code is already in place? which would help explain the high quality content on HN.

As ever, thank you Dan (and Scott) for maintaining this wonderful resource.