It's not a bad
idea strategy if you have a big stash and trading as a hodler as the small gains make a big difference, it even gets better if you are leverage trading which will give you profits either markets go up or down...
But for a small account, you might trap yourself and buy expensive bitcoins..and besides today people talk about DCAing and selling shouldn't be the idea

BTC to the moon
Depends entirely on the OP's plans and abilities: we can't know the bottom and the biggest ATH of each of BTC's rallys, but we do know it's going to surpass them all eventually, and that's all we need.