I think a fair compromise would be to advertise calibre's editor in the Sigil forums just as often as we advertise the features of the Sigil editor in the calibre forums.
You DO seem to make a habit of it eschwartz ... perhaps you're unaware of how often you do it? It does become a bit "broken-record"ishly annoying after a while. I'd prefer it if you gave it a bit of a rest, too. Especially in a bug-fixing/tracking thread.