Investing in bitcoin is great idea. I have just invested in bitcoin, litecoin and dogecoin. Im now waiting for these coins to rise up. I would then convert litecoin and dogecoin to Bitcoin so i would have more bitcoins. You can pay with bitcoins not with dogecoin and litecoins. Thats why i will that. Don't forget investing in altcoins, you can focus on bitcoin, but don't forget them also. You can make a lot of money out of it.