Social Media Examiner came along and did that - dominated a niche I mean. I think Social Media Explorer was the original go-to source of info for social topics but Examiner came along and drew a massive audience. Michael Stelzner of SM Examiner hired a customer WP developer and spent a lot on the design so almost immediately the site looked like it was a well established site with a large body of content. I don't know how the other sites in this niche reacted though.
I can understand why some people do not like competition in a niche - maybe they're completely dependent on whatever income it provides and cannot allow someone else to upstage them. What concerns me is those who understand negative SEO and deliberately sink their competitors or use other dirty tricks to get their own back. The whole "this town's not big enough" routine jealous bloggers experience must be their own lack of passion or willingness to raise the bar..
I don't know how you manage to control yourself with these difficult people sending ridiculous emails like that. If they spent as much time dwelling on solutions instead of dwelling on what to put in their nasty emails they might be a lot better off!
Thanks for sharing though... Although it is clearly frustrating to receive emails like that it gives you great material and makes excellent reading. I'd like to hear more anecdotes like that, it's quite comical LOL