Very much to the contrary, dear 411A, large operator use the no-alternate option quite extensively. Maybe not in scaresly populated countries like Aussieland, where well equipped airports are not that frequently around.
Here in Europe with maybe the most sophisticated regulation, we are allowed to go without alternate if you have 2 independend runways, its approach aids and a certain wx minimum.
Not having an alternate offers various advantages in planning, and offers flexibility in using your remaining onboard fuel. In case of fog, having an alternate and lots of fuel is always an advantage. More runways don't help if the weather is bad.
Dani