Quote:
Originally Posted by Baraka_Guru
Informally, yes. Formally, it would be more correct to say "I purchased a treadmill."
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It's not talking about the purchase, but the intended benefit. The physical benefit.
As Redlemon pointed out, even the dictionary demonstrates that "investment" does not always refer to a monetary investment. It's more about an intended beneficial outcome after spending or devoting something now. As such, it's entirely proper.