When EPL stars go to Real or Barcelona (or maybe a few others?) is it mainly a matter of massive dollars which the EPL team won't pay, or is there more to the dynamic? (You guys have been following this stuff so you know these other not-on-the-field dimensions, while it's a mystery to me.)
Related to that: are some teams in the EPL just out-of-sight more wealthy or spend-crazy than others? Is there no payroll limit? Can an insane rich guy just buy anyone he wants?
To your first paragraph money is a major part of it. However, the movement of the top EPL stars to the other big clubs seems to have dried up recently. I'm trying to think of the last big in-form star to leave and it might be Suarez from Liverpool to Barcelona, so almost 3 full years ago.
I think most people judge the wealth of the EPL clubs best by their wage bills. Over the last decade it's looked like this:
1) City
2) United
3) Chelsea
small drop
4) Arsenal
decent sized drop
5) Liverpool
decent sized drop
6) Tottenham
decent sized drop
7) Everton
8) West Ham
To add some numbers, City's wage bill is £225 million, Arsenal is £200 million, Tottenham at £120 million, and West Ham at £80 million.
Everyone from Spurs and above is within the Top 15 in European wage bill spending.
Roma, AC Milan, Juventus, Bayern Munich, PSG, Real Madrid, and Barcelona are the other non-EPL teams in the Top 15.
Real Madrid and Barca are always #1 and #2 the former hovering around £245 million while the latter is way ahead at nearly £300 million. Painting with a broad brush here but what makes these teams spend so much isn't always the average player makes a little more (they do) but the top earners are WAY out in front of the rest of the world.
Bale and Ronaldo are combining for over £700,000 per week in wages. That's an entire wage bill for the lower 5-ish EPL teams.
Anyway, I definitely think the EPL is "winning" a lot of the transfers around the world, at least in terms of spending. How they utilize that money is another story!
Alonso, Luiz, Slimani, Mustafi, Perez, Bravo, Pogba, Jesus, Sane, Janssen, Mkhitaryan, Batshuayi, Bailly, Gundogan, and Xhaka.
Those are all the £20+ million transfers into the EPL from other countries since the summer. That's a lot of talent. And not much is leaving.
In fact, situations like Di Maria with a one year horrible stint at Man U and then shipped out on 80 cents to the dollar back out of the EPL seem to be more common (on a smaller scale) than big stars just leaving for more money in Spain or elsewhere.