Surely because they can be so easily manipulated, no? I mean, it used to only be "chart registered" shops in ye olden days that counted and whilst I'm sure in the days of computers this is not the case, surely albums, for example, sold at gigs can't be monitored and so via the website may be the same? "Home Counties" sold 3215 copies last week, apparently, which is down on "Words And Music" (4538 copies), but they've done a lot more promo, had great reviews, had a lot more exposure than with that album AND, most importantly in all this, the online bundle of 3 formats (vinyl, cd and cassette) was so cheap it basically gave you the cassette for about £2 more than buying vinyl and cd individually and so EVERYONE in the Etienne fanbase ended up buying that, which surely counts as 3 sales?
I'm not trying to do a "stocking problems" here, but I can't seem to get an answer either way wherever I've looked. Maybe
@Robbie knows?
(I also wondered if that had some effect on the Katy Perry album "only" appearing at #5 in the midweeks, as the deluxe was only available through her own site and would have probably seen most of the fanbase buying from there)