ruthless, you seem as frustrated as myself with many of these posters,
I personally like to give the benefit of doubt, perhaps they are on a cruise and internet is spotty at best, and I certainly wouldn't concern myself w/ cruisemates.com.
But, I do see many that do not follow up or through, it can indeed be frustrating, a feeling like one is wasting their time.
So how is your cruisemate searching going? I was quite fortunate this year so far!