In fact, I have started buying 3 days ago... small amounts monthly. All my BTC before were earned, but want to get more as I realized its potential to go up.
Well, if you have a lot of money I suggest to buy more bitcoin because having a lot of bitcoin can help you to become millionaire. In addition to that, if you can't afford to buy bitcoin there are some way to earn bitcoin. You can gain bitcoin in faucet but it takes time to wait.