They say investing to gambling sites is much safer than doing trading. But if you really want to have control on what you will earn at the end of the day better do trading than investing to casinos.
"Trading" is a zero-sum game (atually worse because of fees), so it's very unlikely you have a system that makes you more than about the 50% annual returns that I estimate investing in Just Dice gives you.
Casino returns are quite stable and predictable. Especially in the case of Just Dice, because most of the profits (nearly 90%) come from staking, and the amount of staked coins is about the same every day (
https://just-dice.com/misc/wagered.txt).
It depends on how good you are at trading and he patient you are. Most people come in making big investments then losing it because they silly and they never thought it out properly. Rather make lots of small investments and secure profits in then and build your way up. Never use a large amount of your total to invest that is a mistake.
What are you trying to say? Is it about trading or investment? Because both of these things have very different perspective and the outcome or the risk. I am sure to put some investment on very old site and trust worthy site like just-dice will get you some quick profit but of course there is a time when some big whale hit big and most probably thing is you lose some but in the end house will win
But in trading, it really depends on your skills and how experience you are, the higher skill and experience you have then the better chance of getting good profit, it is a slow profit but of course it is constant and less risk