please school me... purchase from AD vs. grey market dealer

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Most likely explanation for the ones who don't is that the retailers that dump watches through them don't want Omega tracing the watches back to the retailer through their stamp on the warranty card.
I am sure Omega tracks which AD gets shipped which serial number watches, so refusing to stamp the warranty card is not going to effectively hide the source of the channel leakage. It must be something else, but I'm not sure what.

Unless there's a market for wholesale watch exchange between ADs which obscures the connection between original delivery from Omega and eventual retailer sufficiently that Omega can't identify leaking through serial numbers.