Barcelona are not a much better team than Chelsea like was shown agaisnt Man Utd last year they had all the possession but couldnt do anything with it. Barcelona have a much stronger attack, Chelsea have a much stronger defense even when missing two first team defenders.
And its not like Barcelona do not spend a huge amount of money on players its not just Chelsea. Barca spent getting on £40-£50m this season, and around £60m the season before that...