The Leica M9 is a 'discount camera' 😉 Every 36 exposures I make, I pocket $20 in film/processing cost. That could be quite a savings ( 'discount' off that $7,000) over a few years. Add into that equation I'll be taking more photographs because I don't have to think about film/processing costs, and also with luck my photography will become better for it.
As for initial cost of the camera, and depreciation factor of digital Leicas... Its a Leica, historically they are on the border of being outrageous cost wise 😱 As has been pointed out here, everyone has their reasons and thoughts on cost/investment justifications. Here in Japan a new M7 or MP goes for around ¥450,000 (that's about $5,000). Used is 'used', great deals out there on great 'like-new' M8s, and used M9s will be showing up, but with demand still high I wouldn't count on big discounts in the short term. Or if you can wait for an M9.2 which should be just as much $, and a year or so down the line probably. A new and improved M10?... nothing on the Pacific horizon, a longer wait, and just as expensive. But if the M9 calls to you, and you can pony up the money, why not?, its just money, you'll use it, have fun, use it in work, and in 3 years or so when the M10 comes out you can still sell it (with all the film savings in the time you had it) or keep using it like the many still happy M8 users out there (you only 'loose' money when you sell, and even used Leica film cameras are not seeing the prices they did a few years ago, and will probably be going down more as film becomes more for the few). Its not a 'disposable digital', and built quality is superb.