As far as depreciation goes here are a few thoughts
At roughly $8000 up front getting in to the 240 is a pretty big hurdle for most people to clear in the first place. If the camera depreciates 50% in 3 years because of the upgrade cycle, you will need about $4000 to get in to the newest model. Once the new model is out the value of the older camera will fall at a considerably faster rate, so if you delay to upgrade your expense of doing so eventually increases.
Now, if you are dedicated to shooting with the M and shoot enough, that's something you[re probably willing to accept.
But here's where is gets dicey.
I have six M film bodies, three R and one LTM.
If I'm just out and about I'll take one body and 1-2 lenses. But if you are going to do some serious work like covering an event or doc / PJ type of work you will need at least 2 bodies (35/50) and quite often I would take three (28/35/50).
M240 x 2 = $15,000
M240 x 3 = $23,000
Now add multiple batteries at $200 a pop plus chargers, so you may end up with another $800-2000.
Anyone want to calculate the depreciation on that kit over 3-4 years, let alone getting in to it? You better be making money off your camera or be a millionaire if we are talking about that kind of expense.
My film M and R bodies weren't cheap and I did purchase several of them new. But the M6ttl I purchased new 20 years ago is still running and will outlast me. I doubt that 240 will still be going 20 years from now. Leicas have never been cheap, but when I started the M6ttl was $2800. That was $800 more than a Canon 1-v or F5 and was jokingly referred to as the 'Leica Tax'. But if you really wanted one it was manageable. By the time the M7 came around I think it was $3500 and I paid about $3000 for the R6.2. $10,000 got you a multi camera system that would keep running as long as you were willing to maintain them. Yes, there is the added expense of film, but that is a slow trickle. You're putting out anywhere from a few dollars a roll to buying a few bricks at a time.
If you are going to hold on to the 240 for 10 years there are a few questions.
Can I get spare batteries 5 years from now? How about 8-10 years from now? You can't just stockpile them for future use, because depending on the chemistry they may have a certain shelf life of their own.
How long will Leica have spare parts? Anyone want to talk about M8/M9 sensor replacement?
It's not like it was with the analog bodies, where mechanical parts don't have a shelf life.
If you think depreciation of digital camera is a problem in still photography you should see what goes on in the world of digital cinema production.
Anyhow, if you can clear the $8000 hurdle of getting in to the M system and can live with a lifespan of 5 years then you're probably fine. It's a very nice camera and the first digital M that really feels like an M. The two worst things about it are the 'dumb' metering system, which will occasionally screw you if you are moving fast and the light becomes 'complicated' and the green tint in the blacks. You'll have to live with the occasional clipped whites, but you can fix the green shadows in post. But don't be fooled. The IQ out of the M is not in the same class as a Nikon D750 or 600. But you are trading that off for the M shooting experience and ergonomics.
I still think Leica has painted themselves in to a corner by not really having a tiered product line for the M-mount. They are in desperate need of a lower cost model and it could be anything from a lower pixel count full frame to a APS-C model in a lower cost body. But right now it's $8000 or you don't play at all, which limits their sales to a relatively small share of the market. If Leica made a lower spec $4000 CL they would be in a lot better shape, simply because they would be tapping in to a much larger pool of potential customers.
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