Then when is true?when we are saying "This is the time to Invest" last march when the price fell hardly?or this recently when before the price spikes to more than $12,000?

This is the problem about you People you only seems to question Bitcoins capacity but never tried to Invest on it so the chance of profiting you may taste.

Sometimes instead of asking same question why not Invest first?even small amount so at least it is worth the risk and if you taste the earning then Mind will change and start trusting this.