how does one save if one is always forced to speculate on the market, or are 10% profits guaranteed every year?
There is no recipe for immortality, no monument that will neer become a ruin, no cellphone battery that will last forever. No store of value is totally risk- and loss-free, including bitcoin. Life just sucks.
Bitcoin wasn't even designed to be such a thing: "non-inflationary", in the technical sense of having a fixed money supply, does not guarantee preservation of value.
The best you can do is invest in things that actually produce valuable goods or services, such as stocks of solid companies, or real estate that you can rent. Then you do not need to speculate; even if you hold the thing for decades, you may get the ful value of your investment back, and some more. But of course you may have bad luck and stock on some Enron or WorldCom. That risk is increased if you are too greedy, and look for higher returns rather than solidity. You must keep watch, and be ready to switch if it seems that the company is faltering. You can also invest indirectly in investment funds, and trade some of the returns for the convenience and risk reduction.
or you can have a crazed monkey fling darts at a dartboard and pick your stocks and investments that way..... just sayin