You are wrong. But that's OK since the statistics are a little misleading if you only look at it on the basis of applicants/spot. But that's clearly not the whole story. As with the Match in general, there's a lot of self selection that happens here. If you didn't match in IM or FM (or didn't even get any interviews) you're going to shoot for the "easy" specialties in the Scramble, not the rare Gas, Derm or Rad Onc spot that's available. The raw number of people who applied to more competitive specialties but went unmatched will be smaller than those who applied for less competitive specialties which will make the numbers look the way they do.
If you were a decent candidate for a competitive specialty and didn't match, you might as well apply to any available spots in that specialty, as well as however many IM or FM (or prelim) programs you can. But if you applied to every single FM program in the country and didn't get a single interview, spending your SOAP ducats on that one Derm, 4 gas, 1 rad onc, 1 ortho and 1 em program (I made those numbers up BTW) is going to be a huge waste of time and money on your part.