
Its a money-saving scam
The reason this occurs is because they have too many pallets from their own suppliers to dispose of in a way that isn't noticable on the bottom line.
So they pass the problem onto us; bastards - the cost of disposing of their rubbish is extreme to say the least - factor in the CO2 costs, fuel, time etc, several times for this packaging in its lifetime, and it is an unmitigated abuse frankly.
No Beer for these cynical suppliers...