I still buy bitcoin so I can invest in ICO's whilst bitcoin is cheap, especially ICO's where the price of their token is locked to a certain value in BTC.

It's a great way of making massive gains, but it can be highly risky so I recommend DYOR and making sure you 100% want to invest in a project's ICO, do not just fall for big discounts and flashy videos, read white papers and look into the team and decide whether the project offers anything unique and will have a demand in the future.