If you are trying to educate yourself, you have come to the right place! I have learned so much from this forum.
As for 3dice, I have said this many times, it is not for everyone. It is just that simple. Do I like the games, some yes, others I would rather watch paint dry. But for me, it is the customer service that keeps me there. No one (for a US player) comes close to their level of customer service.
As with any online casino, you win some, you lose more. It is no different at 3dice then an RTG casino. Yes I have won at 3dice, but I have lost too. I take it as is and don't look into it any further. As for players winning thousands, I am happy for them. But you know if they are winning that much they are betting high, because the low better, winning 14 cents or 28 cents at a time when betting 1.20 or 1.40 USD will never see that amount. I am happy with my wins, just as I am when I lose. I know that I can not win every time, and when I do win there, it is hassle free.
As for your stats, you have every right to ask about them. But in all reality, if you are not being entertained at 3dice, then maybe you should leave. It is not in your best interest to keep depositing there and getting more frustrated. It just makes you feel worse and even more unhappy. Is it worth it? That is the question you need to ask yourself. If the word "NO" is the first thing that pops into your head, it is time to move on. And there is nothing wrong with being unhappy at 3dice, take a break, leave it alone for a while, or forever. No one can make that decision, only you can.
No matter what decision you make, I wish you the best and hope you find a place to make you happy and keeps you entertained.
All the best,
LH