honestly I'm a bit confused about this grey market thing. these products are sold by well known companies so I suppose they're not illegal, we also get the same product as being sold by local big retailers with the same 1 year warranty and I believe these products are from the same manufacturer which is CANON, so what's the difference?
Canon has separate divisions setup around the world. Each division operates like a separate company, and has to comply with local laws, etc. They only provide warranties for the cameras they actually sell.
I'm not defending this, but mentioned it to explain why things are so stupid.
Long ago, he US government used to enforce Canon, Nikon, and Pentax gray market rules and customs would seize any gray market imports. This was happening until at least the late 1960's.
In order to buy a gray market camera from Hong Kong (at a much lower price), we could order it from the dealer, and they would remove the logo if possible, or paint it out with black or matching paint to get it past customs.
Then they would send you the logo and lens cap, manuals, etc by separate mail so you could glue the logo back on and get the manuals and accessories. finally, someone passed a law telling customs to stop it, and US prices dropped.
I still remember that we bought all brands of cameras from TK Wood in Hong Kong. I don't find a record of them on the internet now.