Well arguably Spurs had a bigger fanbase than Marseille even in 2004 even though they were a bit shit, the economic potential of the Premier League has always been massive just like the global fanbase.
Frankly it'd be nearly impossible for those two teams to get the very best players unless they are purchased by someone in the Forbes Top 50 even if in theory the quite ridiculous idea that all of the ESL clubs had to give up all their players would happen. The CL price money wouldn't be enough without the biggest teams from the biggest leagues.
Argubaly where? Marseille are the most supported club in France.