While the number may have been pulled from nowhere, I'm not wrong in what I said. The winner usually ends up selling far fewer records against the a few of the "losers" from the same series
Not true at all.
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Series 1 (2004)
Winner: Steve Brookstein
Runner-Up: G4
Neither could manage more that one top 40 hit but Brookstein wins as his reached number 1 whereas G4's only number 9.
Series 2 (2005)
Winner: Shayne Ward
Runner-Up: Andy Abraham
Ward's 6 top 40 hits clearly puts Andy's 1 entry to shame.
Series 3 (2006)
Winner: Leona Lewis
Runner-Up: Ray Quinn
I won't even bother explaining why the winner of the title that year was justified.
Series 4 (2007)
Winner: Leon Jackson
Runner-Up: Rhydian Roberts
Worst year in XF history but Leon's 2 top 40 hits, including a number 1 beat Rhydian's attempt whose only single flopped and could only manage number 93.
Series 4 (2008)
Winner: Alexandre Burke
Runner-Up: JLS
Complete opposite of previous year with two big acts being found. Both have had very good careers with numerous number 1 between them but JLS just take this one, and become the first act so far to finish runner-up and beat the winner of the show by charting 11 times to Alexandre's 8.
Series 5 (2009)
Winner: Joe McEldry
Runner-Up: Olly Murs
For a second time, and only the second time the runner-up goes on to do better than the winner. This time it's more clear cut though than above. Olly's 8 top 40 hits trounce Joe's 2.
Series 6 (2010)
Winner: Matt Cardle
Runner-Up: Rebecca Ferguson
Normal service resumed, Matt takes this just on the basis out of his 2 top 40 hits he's got a number 1 whereas the best Rebecca can do from her 2 chart entries is number 10.
Series 7 (2011)
Winner: Little Mix
Runner-Up: Marcus Collins
Forget the 12 month rule. Little Mix have knocked out 3 top 40 hits since winning and bagged a number 1. Marcus’s “7 Nation army”, his only single to date, could do no better than number 9.
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So by my reckoning, only in 2008 & 2009 have the runners up done better in terms of singles released and numbers sold. I could look at albums instead of singles but i don't think it really would be that different.
I think the problem is people remember great acts that didn't win (like JLS for example) then remember crap acts that did win (like Joe McEldry), forget that standard of talent was different between series and somehow conflate in their mind that the acts that don't win are better.