If you had a league consisting of say Spurs, Everton, Liverpool, half a dozen lower PL sides, then made the rest up from the championship, you've probably got a league of similar ability to the Eredivisie. Players at top Dutch sides (Ajax, PSV, Feyenoord, Twente, Vitesse) have hit a ceiling where there isn't a lot more to prove in their current league, but they've not done so well as to make the likes of Chelsea, United, City sit up and take notice. For some of these players, those teams are their aims, but to get there they need a stepping stone on the way. That's where we come in, if players can follow in Benteke's (yes, Genk are Belgian but go with it!) footsteps and impress in the PL, then a top, champions league side are much more likely to come calling. So that's what makes us attractive to the players, whilst the players are attractive to us as there's less money in other leagues, so we can still compete financially with other foreign sides who might be interested.
The players we're looking at are young, talented, and ambitious. Those joining us are sometimes leaving behind a chance of domestic cups/leagues, Europa/CL football, so that they can prove themselves. I really like that, and it's something we're going to struggle to find in other PL teams. There's about 10 roughly equal teams in the league right now, if a player thinks they can prove themselves, they may as well do it where they are. The only way to tempt them is with wages, and a hefty fee to the club.