Yes, but what you also have to remember , London is on average 25% more expensive than the rest of the country. Hotels, venues, rental equipment etc. etc....not attractive from a promoters point of view.
Capital city is not a just reason for playing, sure you have a higher concentration of prople living in the area, but to be completely honest it seems to me that the concentration of melodic rock fans (as I assume that is what we are talking about on this board) is not in London, but further north..Notts, Sheffield, Birmingham, Dudley, the North West in general.
The world does not revolve around capital cities, although living in Ireland you would imagine it did, with every decent gig happening in Dublin and NOTHING outside.
Just a little fact...... attendances
Tyketto London = 498 people Tyketto Dudley = 1151 people
Firehouse London =550 people Firehouse Dudley = 1102
Danger Danger London = 345 people D2 Dudley = 410 people
I don't think these facts support your assumption Christos :)
Cheers
Kieran