Today price is best example of market confidence in BTC. In 24h bitcoin dipped and went back with the price, nothing really happened, except it take over 54% of market cap and slaughter all altcoins!
Yes that was a very good strategy, taking advantage of the current situation in the market by investing a huge amount is the best thing to do to earn more profit before the market price pump up again.
Yes people already have invested a lot of money in bitcoin, most of the people are holding bitcoin for last few years, and still they like and wishes to continue holding bitcoin, because still they are expecting that bitcoin price will reach to 100000$ in near future which people were already expected from bitcoin in 2018.