Pam,
I admire your brand and quality loyalty and determination. Unfortunately, the whole frame industry is running on such practices and, stealing design ideas is water under the bridge for all its players.
It's very hard, next to impossible to legally protect a design. The creator needs to prove his design being original (!) too. I don't know for sure, but I'm guessing that big manufactures like LJ, Roma or LaMarche dont spend their time and money with protecting their original (?) designs since any Brazilian or Indonesian molding fabricant can alter a minute detail in those original moldings and hence be off the hook.
I am for highest quality and finest design in framing too but, as much as I hate to say it, resisting knock offs, regardless of their real quality and price merits, is not a profitable business taking. Your said that some knock offs were quite good looking. In this terms, if your competitors will buy faked LJ and sell it cheaper, I am afraid that this is the only thing most costumers will ever remember.
LJ, Roma and LaMarche are mass fabricants of molding of fairly good quality. But their products are of no collectible value and the resulting frames will never undergo any restoration when they'll get damaged in the future. To love their molding may be understandable, devoting yourself to their product and service is debatable. Keep an eye out for new comers. Some time ago LJ, Roma and LaMarche were new comers too. Do I make any sense?