Randy posted (in a similar thread on Milepoint) a graph
http://milepoint.com/forums/threads/...lepoint.35507/ showing that Boarding Area now has about 40% of the unique readers of FT. Even adding in Points Guy, Frugal Travel Guy and MMS who are not on Boarding Area, you will be below FT's readership. And, since many FT'ers will read at least 1 Boarding Area blog anyway, it raises the question of how many people ONLY read blogs and ignore FT. Perhaps fewer than we think.
The Radisson promo was also interesting in terms of reach. The Country Inn & Suites offer still does not seem to have reached 35k sign-ups, despite many people doing multiples. Yet the Wyndham Discover America deal sold 2k packages in minutes. This may give you a rough and ready figure of, say, 10,000 people who take this stuff seriously!