For me its is more about going to new places, riding new places, seeing new things. I did both STARs in Lexington KY, and I would return to Avon in a heartbeat. But I've really enjoyed the 3 STARs I attended out west (Taus 2010, Avon 2012, Rapid City 2014) as I took a week after the event to ride around places out west that I'd probably never see otherwise. A week in Colorado, then Wyoming, then Montana. This year was similar with LaCrosse, an opportunity to take the ferry across Lake Michigan and then 4 days return ride back thru Michigan's UP.
Most of the various STARs in the east/SE (State College, Charleston, Lexington twice, Asheville, Staunton) were closer to home, and places that I had on most occasions done some riding in. They were still fun, but different. The exception was 2016 Stratton VT, and other things made that even more special.
Wait what was the question? If it is "should we return to Avon or are people tired of it?", I'd go back.
Seriously though, If the trade-off is a location we've been to before but more accessible vs. somewhere new but further away and attendance will be low (e.g. Mamoth CA) I vote for the larger number.