My own experience in Seattle was that the Muckleshoot slot payout was as bad as Spirit Mountain or non-existent, but as I moved north it got better. They said when the casino opened years before, they frequently won, and sometimes won big (they didn't say what their winnings we're), but in the last couple years, their experience was donate and leave the premises, as had happened to them again today.
The couple lived nearby (within 15 miles as I recall), and because I had never won anything here, asked what their winning experience had been. Their's is truly one of the best and largest buffets around. The last visit, within about a month, I met a couple in the casino's awesome buffet. It's almost like give me your money and leave. In the recent couple of years, I became a Spirit Mountain Casino member, and visited the casino pretty regularly while on the way to the central Oregon coast around Lincoln Cirty The Spirit Mountain slots have never produced any positive results. In Seattle I frequented Muckleshoot Casino, to the south of Seattle in Auburn, Snoqualmie (financed by Muckleshoot) & Tulalip casinos (4) in between, and Angel of the Winds, north of Seattle, in Arlington. Have been going to Lincoln City regularly, several times a year for about 6-8 years while living in Seattle area.