If at that time you spent $ 10,000 buying BTC at the time you created the topic and holding to the time when, when the BTC exchange rate reached $ 20,000, you have doubled your existing assets. Or you might consider investing in Ethereum, as the currency's growth rate is also very strong, predicting the future will replace the co-bitcoin. So it is not always late to invest, if you have money to invest in BTC and ETH, will never lose assets.