I've often wondered this myself...and thought it was a pretty good scheme on their part. My Inter bank roll isn't qute big enough to safely play much beyond 2/4, but I'm always watching the bigger games. The pound games often look easier than the dollar equivalents despite being nearly twice as big.
My experience on the limit, pot limit, and no limit holdem and limit stud tables is that after 9:00 pm ET games get tougher all around. I think it's because all the Europeans have gone to bed. Most of the Europeans want to play in the BP and Eu games and they're the big action givers at the site. For example the see flop % for 1/2 holdem games around 3
m ET is usually between mid 40s and high 50s, but after ten is usually in high 20s low 30s..And stud seems to follow this trend but it's not as extreme. So, I think that generally the higher rake is made up for by the higher stakes and worse play and generally Europeans are the inferior players at Inter.