So you are basically saying that investors buy low and sell high.
It's the only rule that truly applies to investments.
You can avoid looking at the price, simply by finding an investment you believe in and frequently buying it no matter what the price is.
I will choose the OP's idea over yours because it has been proven to be the smartest way of investing for as long as investment history can be traced. This is working like magic in Bitcoin too because Bitcoin on its own is an easy investment which will make almost all investment strategies work, including the foolish ones. However, as yours and the OP's styles work, the distinction between the two is that the OP will make more money than you.