The only thing I really believe is that the lotteries are making more money off of the players. Many people I know have quit playing P3/P4 or they play very little (less than $5.00) per draw. However, since they are not winning at P3/P4, many of them play more scratchers which in turn also enriches the lottery's coffers. Some of the lottery results make absolutely no sense whatsoever. I also believe that they are looking at what folks are betting on and always they want to bring the lowest paying combination.
From my own tracking experience for this year only, there are longer draws between consecutive numbers, 2 digit return numbers, doubles and certainly triples. These are the money makers for the players. The lotteries are using more O carried combinations which means don't use anything from the previous draw. I don't call it a conspiracy but some of the results for this year are questionable.
The ONLY way I see that a player can profit is to track PATTERNS carefully and maximize their wins. Many players are still using the same old way to pick their numbers but if the lottery changes, they also need to make changes to the way they select their plays.