I can't speak for By-Tor, but I know I'm not going anywhere soon. Keep reading and commenting and we'll keep posting.
As for the influence they have, I've received many a PM about the IWC GST or the MoonWatch, for instance, with people telling me their purchase was directly attributed to my pictorials. It's very flattering, and stuff like that encourages me to do more (like my By-Tor-inspired IWC guide due soon).
Still, I'm just standing on the shoulders of giants. There are many whose reviews and pictorials encouraged me to buy watches, too.