Like most of the responses so far, I got here via PBS shows, travel books and Google. I used all those information sources and the RS website to plan a 2 month trip for my husband and I in 2009, his 1st but not mine.
Over the years this particular resource in all its forms and with all its names has continued to improve and become easier to use. The expertise and advice of Forum participants, the books and the website have helped me immeasurably.
From 2009 on I self-planned all our trips until 2014 when I wanted to combine a visit to Istanbul with a self-planned 4 week trip to Greece. I felt totally out of my depth to self-plan for Istanbul, so I signed us up for the RS week tour.
2016 was the last year I self-planned an entire trip, 6-weeks to England and Scotland. Since then I've taken 4 RS tours, all sandwiched between self-planned time before and after.
Having gone on a total of 5 RS tours now, I too remain perplexed by the consistent majority of people on the tours who know nothing about the existence of the Forum or even the website itself.
How do they find out about the tours? How do they make reservations for them?