The Everett AquaSox stadium debate is the kind of story that looks local until we remember who else has something riding on it. For the Mariners, it’s about keeping a key piece of their player-development ladder close to home. And for everyone else, it’s another reminder that minor league baseball has become a much more expensive business than its neighborhood-ballpark image would like us to believe. Everett City Council’s latest funding approval is good news if we want the AquaSox to stay put. The council approved another $10.6 million to move the proposed stadium project forward, with the city’s official project page describing the planned Outdoor Event Center as a downtown facility meant to meet MLB’s updated minor league requirements while also hosting community events, sports and festivals.   The AquaSox are Seattle’s High-A affiliate, they are close enough for Mariners fans to actually follow in person, and they give the organization a regional development stop that feels connected to the…