I have have done similar to you mate.  I managed to get all loose sets and most mint empty albums for the world cup and euros collections going back the mexico 86 . I never collected the packets though always tempted to open them 🙂 I decided to try something different and collect the panini football loose sets but have now decided the real value is still in the euro and world cup collections so going to get back to collecting more sets of them in the new year.