Commercial operators just don't spend like the military. We buy S-61's back in the 1960's and continue to operate them 30 years later. The original batch of Bell 212's, still flying for operators in various parts of the world. We finally bite the bullet and buy the S-76, a totally new type, and sure enough continue to operate the same airframes, without buying any more new ones for the next 20 years +.
Compare that to the military that have a continuing turnover of aircraft, and suddenly it is clear that the financial pressures that commercial operators are under, make them pretty poor customers.