I think the reason these sorts of threads draw so much scorn is that, if you were really interested in developing a new opening, you could simply try it in your own games and see how it works. After tinkering with it for a while, then maybe post a topic asking for input on some issues that come up.
What these threads usually are, is "I copied moves from random opening that I like to make one up, I have never tried it but please tell me how awesome it is." This sort of thing quickly becomes grating, and people lose patience.
At any rate spending time creating new openings may certainly be an enjoyable private hobby but it's pretty much a waste of time if we are talking about a real desire to improve at chess.
You have "engineered" a new opening?