Wow , that sucks. No push out and no jump cues in a tournament that is non-apa event but uses APA rules which is basically, no jump cues and no push outs. Why?
Because they're using APA rules.
The question you should be asking is why are they using APA rules.
Jump cues and push outs do give an advantage to a better player. If they wanted to play in an actual standard 9 ball tournament there are probably other houses that can accommodate them. It sounds like this particular house is trying develop a player / tournament base that will come back and spend money
If they are trying to build the tournament player base, and it's a place that has mostly league bangers that are not as skilled as some of the actual players that come in there the APA rules give the less skilled player a little more of an "even playing field".
The cream will more than likely rise to the top anyways, but the APA rules probably give the lesser skilled player a better chance to finish in the money and keep them coming to play in his tournament