the best investment gambling site is moneypot,
much gambling site use service moneypot
another moneypot maybe you can try in crypto-game net or bitves pliko, because much gambler playing in there
Moneypot site used to be quite good for investors but since last few months all investors under loss. Now moneypot is implementing a maximum bet limit to reduce gamblers to win huge amount and bring losses to investors. So as of now it is better to avoid and wait for some time to see how they will perform for next one to two months time.
moneypot is a good choice and they have quite good statistics and also good huge numbers of players, so i think there investor would really gain some profits if they invest on this huge site, but as you said they should remember that losses might still occur if they will not used their brains before putting up their money on this sites, since eventhough they are huge one but still the losing chances for bad events or wrong calculation will still occur in the instance,