This isn't about sales number. Leave that argument for another thread.

This is about Sony creating a week 0 sales.

Technically, week 1 would be the first week that the hardware is available in stores for purchase.

Does it even make sense to have a week 0? Doesn't it just push the release date 1 week ahead and so, week 0 would actually mean week 1, week 1 = week 2?

Now, let's suppose we let Sony slide and allow week 0.

What's stopping others to launch week -1, week -2, etc?

"What's stopping others to launch week -1, week -2, etc?"

"In early 1995, Sega of America president Tom Kalinske announced that the Saturn would launch in the U.S. on "Saturnday", (Saturday) September 2, 1995.^[15] This date was greatly anticipated by gamers and the media. It also allowed Sony to announce that the PlayStation release date would be one week later on September 9, 1995.^[16] However, on May 11, 1995, at the first Electronic Entertainment Expo (E3), Kalinske announced that the "Saturnday" date was a ruse and that the system was being released nationwide by four select retailers (Toys "R" Us, Babbage's, Software Etc. and Electronics Boutique^[17]) immediately.^[18] It appeared that Sega had a real opportunity to take a commanding 4-month lead in the 32-bit race by beating the PlayStation to the market"

-4 Months. Its already been done, launching before the launch.

Several games have had Week 0 launches before, although it was mostly because of broken street dates.

You either count it as Week 1 and show that it had a disappointing launch but massive increase in Week 2, or count it as Week 0 followed by a more impressive launch but larger fall afterwards. I don't see the big deal either way personally, but I think the fact that people like to use that number and twist it to suit their bias is why certain people stress for a Week 0.

Logically unless you are Nintendo troll there's no point in counting week 0 as week 1.

It was limited to one out of two SKUs with more expensive no value added bundle and sold only in USA/Canada.

It was just a clever way of getting the people who wanted a Vita first to pay more for that exclusivity. Pretty much all consumer electronics are based on a model similiar to this, it surprises me more consoles haven't done it tbh.

you so win.