There is no "true" random. Anywhere.
It's the Schroedinger's cat of the Statistics world. If we use tools such as dice to determine a random number, we have to mark each side of the die to distinguish what we're looking at. An no matter how you mark it, there is no way to create a "perfect" mark (or even a perfect cube) that won't influence the outcome, no matter how miniscule.
What about the "Random" function on a calculator? Or RAND() in Excel? Both use a
Pseudorandom Number Generator that mimics the properties of random numbers. Even the random number from
Random.org are generated by atmospheric noise, which seem to be the most random thing in our limited environment. But even that can be debated.
The thing is, you work with what you got. Are Casino Dice more balanced than most gaming dice? Yes, since casinos have to live by rules that enforce a higher standard (if there was a professional gaming league, they'd be using the same dice to be sure). And for every study that shows pipped dice roll low more often than high,
you can find another that says the opposite.
Which brings us back to the original topic. Superstitions arise from because people believe that their objects have 'memory'. Las Vegas was built on that principal. When you go to a roulette table in a casino, they usually have an LCD screen showing what the last 10-20 numbers were. This is to entice you to bet that the table "remembers" those numbers and will influence the outcome of the next number. Many gamers will bring their dice out at the beginning of the game and roll them a half-dozen times to "get the 1's out".
My point of all this? As long as you aren't using loaded dice, the differences are so minuscule to not matter. And that's coming from somebody that graduated with a Mathematics degree and took Advance Physics for fun.