I hear your point, and if we had a fan base that actually filled the stadium even twice a season, I'd give it more weight. The bottom line for me has always been that Pullman has NEVER supported 4 home games a year, let alone 7. I'd rather the University put on a handful of well thought out, party atmosphere "events" as opposed to consecutive home games that lack fans or excitement.
Let's keep in mind that there are bigger programs than WSU that play off campus, or even out of region, games. Here are some of the 2015 neutral site or off campus home games.
Colorado vs. Colorado State (Denver)
Notre Dame vs. Boston College (Fenway Park, Boston)
North Carolina vs. South Carolina (Bank of America Stadium)
Arkansas vs. Texas A&M (AT&T Stadium, Arlington, TX) **Conference game**
Oklahoma vs. Texas (Cotton Bowl) **Conference Game**
Florida vs. Georgia (Jacksonville, FL) **Conference Game**
Auburn vs. Louisville (Georgia Dome)
Arizona State vs. Texas A&M (Houston, TX)
Alabama vs. Wisconsin (AT&T Stadium)
Can we also consider that a big reason why some of the Seattle games were duds is because WSU doesn't have the slightest clue how to put on an event? Forget the past experience with the Seattle game. Why can't WSU figure out how to sell 50K tickets and put on a Hell of a tail gaiting event once every few years at Seahawk Stadium?
Labor Day in Seattle vs. Nevada or the following week vs. Boise State in Seattle *should* be relatively easy to market.