Do casinos give out their own person odds, or do they have odd providers that do the job for them? Sometimes I compare some of the casino odds, and the differences are actually not much, both online and in agent shops. The only difference I notice is that after your bet staking, some casinos offer much bigger bonuses than others, which makes the potential winning amount higher than the others, but the differences are usually not that much.
They have providers that gives the odd, seems the OP is not aware of how the odds are fixed. If you read the body of the post, you will realise a little deviation from the caption of the post from odds to discussing running cost, manpower and other things that have nothing to do with the fixed odd. Maybe he was comparing the profitability of physical and online casinos for which I believe online casinos is cheaper to run and more profitable.