That is now accepted usage of 'Invested' but I strongly suspect it acquired that usage fairly recently and the usage was coined by advertisers and salesmen.
Feel free to cite a reference supporting your "strong suspicion". In any case, I initially objected/responded to the comment:
A pet-peeve of mine of people calling consumption for "investment" when it clearly isn't.
based on the current
accepted definitions of the word investment
. An investment
is not strictly limited to capital outlaid with the intent to profit monetarily
Then there is this defintion:
[countable] a thing that is worth buying because it will be useful or helpful e.g A microwave is a good investment.
Definition of investment noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
Whilst a DAC could be regarded as investment in that sense of the word, in that it has a use, in the context of the statement made that usage makes no sense
''Still, in UK a used Dave's value, after say five years, still is in 60 percent of the new.
Not a bad investment.''
Since once sold it ceases to be defined as an investment re the 'Useful' definition of the word and since the loss would be approximately £4K on the £10K purchase price it does not conform to the other meaning of investment either: The outlay of money usually for income or profit
If the poster's idea of "not a bad investment" (monetarily) is losing 40% of something's value over the course of five years, then I won't be listening to his advice on the stock market. The only
compensation for the almost certain loss in value of a durable consumer good is the utility/enjoyment it provides during the course of ownership. From that standpoint, a new DAVE is probably not a great investment as there are cheaper alternatives that provide the same or better utility (from a technical standpoint). OTOH, if
a given consumer has convinced himself (or had Rob Watts convince him) that DAVE is the best-sounding DAC available at or below its price point, then he may feel
that owning a DAVE for five years was an excellent investment (in his own happiness/quality of life). I will assume that "Not a bad investment" was intended to imply that many DACs wouldn't even be worth 60% of their original retail price after five years.
In any case, I
will continue to consider the money I've spent on home A/V equipment to be an investment
. If others disagree, that is their prerogative. Apologies for going somewhat OT.