sugarrae, I have read some of your threads from the relatively dim and distant past, and of course they are valuable. I'm sure your site is equally valuable- it just should not be advertised here.
The test isn't
"Is this person connected with the site being promoted"
"Is a site being promoted"
The domain-dropping above added nothing to the discussion. However, if you were to post a subject in such a way as to encourage discussion, and reference a deeper resource elsewhere (including your site), personally I think that should be allowed.
The slippery slope is that there would be active pressure on writing an incomplete post, just so you could link out, decreasing the quality of the WebmasterWorld experience while sending traffic to your own site. However, depending on the Seniority and standing of the member, I would suggest that mods should be less concerned about "losing" traffic, and mostly focussed on if the on-site post is of sufficient interest and quality to other members. If so, and if the link is on-topic to further resources, then let it ride.