With investment money in bitcoin is risky, certainly bitcoin we drop by up to 100% because even lost stolen hackers, there is no guarantee bitcoin system of safe from thieves.
Can't your fiat money be stolen ? Or your investments in stocks/bonds are coming with zero risk for your money ? Bitcoin is just another type of investment so it also comes with all usual risks typically an investment will be having. 100% drop is only possible with lost bitcoins, value will never drop that much. But, honestly compared to any other investment types like bank deposits/real estate opportunities, I believe bitcoin investment is good as it is fetching high returns in quick times and hence I am ready to bear the risks it is having.
Do you really believe that real estate is a safe investment? This is not entirely true. Maybe is more resistant in time but real estate follows the development and economic progress of the country which is located. As an example look the prices in UK before and after brexit.
I met a couple once who bought a big house in Cambodia for 20 000 EUR a few years ago, now it is worth 100 000 at least.
But not everyone can invest in real estate, and for now, the profit made with Bitcoin is more interesting and obviously much quicker.
Don't be too greedy with Altcoins though (or pray you get lucky.)
