These are the richest clubs in the world:

1(2) Real Madrid £186.2m
2(1) Man Utd £166.4m
3(3) AC Milan £158m
4(5) Juventus £154.9m
5(4) Chelsea £149.1m
6(7) Barcelona £140.4m
7(9) Bayern Munich £128m
8(10) Liverpool £122.4m
9(8) Inter Milan £119.7m
10(6) Arsenal £115.7m
11(12) Roma £89m
12(11) Newcastle £87.1m
13(14) Spurs £70.6m
14(17) Schalke £65.8m
15(-) Lyon £62.7m
16(13) Celtic £62.6m
17(16) Man City £60.9m
18(-) Everton £60m
19(-) Valencia £57.2m
20(15) Lazio £56.1m

These are the last 20 winners of the European Cup:

AC Milan (3)
Barcelona (6)
Liverpool (8)
Porto
ACMilan (3)
Real Madrid (1)
Bayern (7)
Real Madrid (1)
Man Utd (2)
Dortmund
Juve (4)
Ajax
AC Milan (3)
Marseille
Barcelona (6)
Belgrade
ACMilan (3)
ACMilan (3)
PSV
Porto

So almost more than half are won by the top 8 clubs.

Just under half are won by the top 4 richest clubs.

But then only 3 have been won by the teop 2 richest clubs.

And Porto have won it as many times as anyone else bar AC and they are not even a top 20 club by value.