"Computing power" is not a currency - you can't store value in it, it's transient and consumed as soon as it's produced.
The time-computing-cost output of a given computer decreases with each new model released. Each new model of CPU does more calculations using less power, or does more calculations over a previously unobtainable timespan.
Your computer, sitting in front of you, does the same, but the amount you spent on it, it now does less.
Computers are massively inflationary - it's why people only buy them when they absolutely need them. It's why you have 1, not 20 as an investment. It's why the second hand market for PCs is terrible - because they're worth far less each month after you buy them then they are new from a manufacturer who is constantly producing more.
And of course more importantly to all of this: computers have value! They do things! They produce value for people by owning them. "Money" does not. Just having it does absolutely nothing!
