yeah plus Yabu was one of the handful of Euroleague players making money comparable to NBA minimums.
The short answer to your question is "they're not getting paid too much, and they still exist, the hard part is identifying them".
There aren't many public sources, but from what I've
read, there's probably only about a dozen Euroleague players making more than the NBA vet minimum (this year $2.3M), and a few dozen more making more than the rookie minimum ($1.2M). And that's across dozens of top teams. Shane Larkin was one of them for a little while. Every so often, someone will get some data and put up a "top 15 earning euroleague players!" listicle and it'll update my understanding but there hasn't been much of a sea change.
And part of what they'd be coming over for, even beyond the guaranteed salary, is that if they can end up being even marginally useful on an NBA roster, the money can quickly grow to well beyond what they'd ever be able to make abroad, even as a star for the likes of Real Madrid (which Yabusele was) or, say, Panathinaikos. So part of the motivation is a bet on upside.
Now, who are those players who have established themselves as high-quality pros in the Euros but who are young enough and ambitious enough to want to make a move, and furthermore look to have the attributes necessary to quickly translate to the NBA? Fuck if I know, I'm no scout. But I think there's a lot of inertia and status-quo bias on both sides: players get comfortable living somewhere, and NBA execs are herd-followers who don't want to be the first one to give minutes to an unproven guy in another league. Once Theis got the stamp of approval, he's been bouncing around the league just fine, but the next 5 Theises (Theisen?), who'd be reasonable bets to do likewise, probably don't have their phone ringing that often.
His case is illustrative of the type we're looking for, though, for sure. Makes his country's top division at age 18, joins its top team at 20, is starring for them by 22, NBA comes calling at 25. I think ideally we'd want players in that age 22-26 window of "have plenty of odometer left, but have established good professional habits and a variety of useful skills - and are still young enough to be open to moving".