Yes, there is definitely a trend where some people deposit a large amount of coin and then they wait for the 4%+ interest every day to gamble with the sites money and not their own.
Huh? The 4% interest is actually annually. Once a year
If you have enough bitcoins to deposit on Freebitco.in, you can gamble for FREE on the daily interest. 
For 1 btc deposit onto the site, you are getting around 0.011% daily so around 11,000 satoshi interest daily. So is this a good amount daily to gamble for FREE ? Depends.
If you are a small time gambler, this should be sufficient for quench your thirst to roll some dust bet but if you own 1 btc or even larger amount then this might not be as good as it sounds .
Bottom line : Dont risk your 1 btc into a site to get 11,000 satoshi daily. This is not a bank, keep only what you can afford to lose on the site. Things can always go south
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Daily interest will be calculated at a random time everyday @ 0.0109589% per day and rounded down to the nearest satoshi.
Yea, there are risk and also reward. You can decide what you want to do with your BTC. I bought a few bitcoins when the price was $300+ back in the day, so I am playing around with some of those on sites like this. No use having them all in cold storage and not doing anything with them and just waiting for the price to rise.
Also... you do not have to gamble every day.. if you gamble like I do, then you will skip a few days and use the accumulated amount over the weekend for instance. You would not have touched your own coins and you have a opportunity to increase it.
There are no guarantees in life, but not risking anything will never bring any huge rewards. My motto : It is better to burn out, than to fade away.
Why don't you cash out already a couple of these bitcoins to use in real life? Do you have a plan at which prive level you will sell these?
I know it is fun and addictive to gamble, but you could loose all. Happened to me once, so now I only gamble with very very low amounts
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