RNG Fairness

[Avenger]

The diagram Livilda posted seems to be the best match for what Yoshi-P said in Update #3, specifically that the lottery results were calculated properly but some results were not properly communicated to the housing server, resulting in the "0" (mis)behavior.

The comments about probability don't seem to match Yoshi-P's explanation. However, they are mathematically correct for the scenario that OP was postulating: adding 0 into a lottery with 4 players would simply reduce everyone's winning chance from 25% to 20%, adding a 20% chance that everyone loses.

And everyone (like OP) should learn to program in Python (or any other easy-to-learn programming language) because it's fun! You could easily write your own lottery program and run it repeatedly to see what the results would be for different numbers of bidders with or without 0 added into the mix.