Great points.
In my case I started out with a small system. And grew. Being off grid I don't have the inspection costs of course. I saved a lot of money on panels. When i started I was paying $2/w. When I upgraded I was paying .80.
I got lucky on my solar controllers also.
Inverter upgrades pretty much cost me no extra. I find that selling off older equipment usually covers the initial cost. Less handling/taxes.
Occasionally I have actually made money. Solar controller costs didn't drop until this year. So fluctuations in the value of the $C vs $US covered any losses. Again I got lucky. I bought US dollars when the $C was 1.02 and sold at .76. So in one case I netted a bit of profit even after 5 years of use.
Planning for the future is a good thing. Changes in technology though are hard to foresee. I think, perhaps, chancing an "opportunity cost" isn't necessarily a bad thing.
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Current projects
Chevy Volt battery pack conversion
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Business where I sell solar stuff
[url]https://www.bobolinksolar.com
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