[rtpg]

12 weeks out of the year is a pretty huge time, so it's likely you were present during those times. If you were in more touristy areas I think there are huge exceptions there (especially in Paris).

You can totally do things like BOGO if you're selling things way above cost, or if you're not a reseller but the actual manufacturer of the good.

An example of this is take out pizza, which usually offers BOGO if you don't opt for delivery.

The Sales rule is usually about when you are just being a market maker and not part of the production process itself. Similar rules exist for things like book sellers (you can not discount the price of a new book by more than 5% of the MSRP).