It actually makes more sense too do it too.
The kings and warriors Gleague teams are within like an hour of driving, both LA teams are in the LA area...
honestly, you go an hour out of Portland and where exactly do they play? Salem? What in Salem is set up to host a team?
At first I thought it was weird when other teams did it (OKC has their Gleague team in OKC iirc) but now that Ive actually looked into it and thought about it, it makes zero sense (esp for Portland) to do it out of the metro area.