A lot of people on here are touting it as the home of Seattle's future AHL team, doesn't make it true. There's people saying that Saskatoon will be home to the next NHL on here, too. I can't find the article on it, but Idaho Steelheads owner has said that his model for attracting fans is based on the team getting results rather than developing prospects. It was a reason, not the main one but one among many, that the Lamar Hunt Jr. didn't team up with the Blues. The Colorado Eagles owner held off for a long time becoming an AHL team since he liked having complete control over the happenings, where you give up a lot if you're the AHL affiliate.
As far as fan entertainment, it varies by market and by person. Some people/fanbases like seeing prospects developed for nearby NHL teams they also follow, like Providence-Boston, Cleveland-Columbus, Grand Rapids-Detroit, Texas-Dallas, etc. Others like Fort Wayne Comets fans are renown for having watched the team in minor hockey for decades and they want to see the team win. Yes, Sioux Falls outdraws every other team in the UShow. But, whether they do the same in minor pro is a gigantic financial risk that not a lot owners would be willing to take.