I've seen this here. I talked to a realtor awhile back that did some research for me on a house that sold in Bellingham WA. about a month ago. The house was listed at about 575K which is about average in that area. It sold in 5 days with 4 offers. Three were cash no contingency and two were at least 5% over the asking price. One offer was a contingency on loan approval for the listed price. The realtor said that was typical of how sales were going in the area.
That cuts out the average person who needs a bank loan to buy an average house around here. Hedge funds are buying these houses and will turn them into rental investment property.