It's where they are based, their history, the league they play in. People travel to England to see them.
The arguments being placed against are based in economics.
You could not re-locate Liverpool to Spain and build a new stadium. The club would collapse. It would not be Liverpool. They are...
Langley
Liverpool- 10
Tottenham Hotspur- 7
Arsenal- 4
Chelsea- 6
Interesting that Arsenal have a very 'English' academy. They have a further 16 home grown players who have featured in their match day squad.