you 're right.
Your players are better from their because those players are actually 89-95% for their level.
What you must be careful of is if someone start buying new players (because a 5* for him is 6* for you)
Check their profiles one by one
What they have succeed in previous season ?
Do they have some token buyer profile ? (official jersey, emblem)
What is their roster ? any young players or maybe scouts/recommended style players ?