Selling your car to invest in STEEM is a big move!
There is this guy on YouTube who did something similar, he sold his house and invested all of his money in Litecoin(s)... He bought them at $3, their current value is $40 and they are set to sky rocket!
So there is a potential to make a lot of money, but just to play devils advocate you could also loose money, so always be prepared for that... but steemit is a really good, so I can see why you would want to invest in it :)