Lidl do a tinned soup that looks from a distance like it has the Heinz label but when you get up close it's a different story. Never chanced it myself.
I recall that Burberry had an issue back in the 1990s. Mostly these premium brands are not that bothered about knock-offs as the market for the knock offs and the market for the real thing are completely separate, so they don't lose sales. The problem Burberry had was that knock-off Burberry became the widespread style choice of the chav, so the customers for the real thing were put off by this and stopped buying it.
Don't think that effect could crossover to hifi though.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.