I dropped by a Sobey's on way home. The 6 only limit was signed and enforced.
I happened to see they had some sale on Coke/Pepsi--$1 per 2 litre bottle....and some couple in front of me tried to ring up 3 entire cart loads of pop. The cashier told them 12 is the limit and they argued the point to which the cashier just advised them our flyer says we can limit quantities, so that is that.
(Talking to the cashier a few minutes later she said the store does not want resellers cleaning out the stock, and that obviously when one tries to buy hundreds of bottles of pop, it is for reselling)