I've stayed with several dozen WS hosts along my tour and have left recommendations/references for all of them, but have only received a few in return. I like to hope that this isn't an indication of my annoyance as a guest, so I've been trying to think of why this might happen. In my case, I'm touring a little later than most in some of these areas and so the folks I stay with don't end up checking their WS profile for several months when more riders come through. I'm also a member of CouchSurfing and have a much better rate of reference-leaving (the technical term, I believe), which I attribute primarily to email notification. Whenever someone leaves me a reference, I get an email. I think if WS did this as well, the reference/recommendation system might be a lot more effective.
Any way the computer folks could make this happen?