Yeah the money is what I was getting at, you've got midtable EPL teams beating out Champions League contenders in Italy/France for players, and that's creating a floor that is too difficult to rotate against consistently. For some teams the Europa league might have that risk too, but I do think it's more of a Champions League phenomenon. For example, Man U's European group stage games this year were against Real Sociedad, Sheriff Tiraspol, and Omonia, they can and did rotate for most of those matches. Same thing with Arsenal being in a group with PSV, Bodø/Glimt, and Zurich. Meanwhile Liverpool had 6 midweek matches against Ajax, Napoli, and Rangers in the UCL in order to advance, and rotation isn't really feasible and therefore has to come at the expense of EPL matches.