Bitcoin has dropped a bit after reaching 50$ mark so I feel it is a pretty good time to invest some amount in bitcoin. But it can go down even more so I recommend investing small amount now and wait and if it falls even more than invest more on it.
That's $50k. 
That strategy is new to others. That after buying, they miss the other dips because they've invested all that they have on that specific price.
Unlike buying with each dips and with little amounts, you'll have many opportunities to buy for every dip that comes.