My observations...
As a host, I enjoyed most of our guest's visits. I liked giving back especially after all the hospitality I have experienced when touring. Since I moved to Tallahassee I am very close to the Southern Tier. There are far more tourists here, but there are also more people who I think are abusing the system. I got the impression that there were a number of guys who stayed in the area hopping from one host to another, staying several days or a week at each one. Personally I expect folks to typically stay one night and be on their way the next day, if they need to stay longer that is fine, but it should be negotiated up front. I guess I could put it in my profile that stays are limited to one night, but the guy who soured me on hosting via WS had other issues which I won't go in to as well. I will still invite tourists to stay if I see them in the area near the end of the day, but have stopped hosting via WS.
As a guest, I have stayed with a lot of hosts who I just met by chance or knew from a forum, but have used WS only a couple times. I seldom know where I will want to stop for the night until I get there. Most WS hosts want some warning about when you will be there. My habit of deciding the day's stopping point at the last minute means that I may decide to stop before I get to them or decide to ride on to the next town. That rules out staying with WS hosts. I do find it useful to have a place to stay the first night of a tour where I fly in late in the day. I'd also call a WS host if I needed assistance of some sort in their town. I have had a WS hold my bike case for me for a loop tour, but I usually don't do loop tours.