> in what instance is this possible?

When I bought my water filter the instructions mentioned how much water could be filtered before a fresh cartridge was needed.

So every month I now buy a new water filter cartridge to replace the old one.

Whenever my car is low on gas I pull in and fill 'er up.

Whether the supermarket runs ads or not, I go in and buy food.

When my shoes wear out I buy another pair.

If I want to stay connected to the internet I pay my IPS monthly access bill.

Today my radiator sprang a small leak. I went to the autoparts store and asked if there was a stop-leak product for radiators. There was. I bought it.

The food I buy for my animals is the food they like - yes I've tried them all.

Whenever I need my hair cut I go get it cut.

Plenty of sales without marketing.

Michael Ross.