No it ain't. Not necessarily. Having said that, I think it's how it's dealt with that the clincher.
My Dad used to run a weekly event for a local charity. My Mum and Nan would attend, and buy raffle tickets mainly to support the charity, which was a godsend to the local community, not because they actually wanted to win a prize. They'd win a prize most weeks, sometimes 3 or 4. It was ridiculous, and they'd always hand prizes back or refuse to claim them. Why did they win so often? Because it was fixed because my Dad was the event organiser? No, it was because most people would buy 1 or 2 raffle tickets for 50p each, and my Mum would buy £10's worth and so would my Nan. They're just in a fortunate position they had more money and could choose to do that, rather than a lot of people attending the event, who by it's very nature didn't have much cash to spare. So my family won more often just because they bought more tickets.
It's the same situation now my Niece is in primary school. As a family we'll support the PTA loads, and so end up winning more stuff, along with the same familiar faces who also buy large amounts of tickets.
However I do agree that the draw should be made publicly at the event, and with full transparency. Last year we also won one of the many hampers of Easter eggs, which my Brother gave straight back. We won the PTA quiz and gave the prize money back to the PTA. Same as my Dads charity event, it gets embarrassing to keep winning raffles, so we make a point of doing the right thing, but it doesn't stop hecklers shouting it's a fix!
The school and headmistress wouldn't even dream of selecting any pupils for parts in school plays etc based on their parents involvement in the PTA. It's frustrating to know that goes on. Mind you, that might be because my Niece is such a bad, wooden, actor that it would completely destroy any nativity 🤣🤣
It's a very poor example your PTA leaders are setting that they're so greedy and supporting these events for the wrong reasons. It's very demoralising for the rest of school, and just perpetuates the strength of the inner-circle "don't question the PTA Mums" that puts others off and shores up the sides of their ivory tower. It's everything that's wrong about PTAs. We're lucky that my Nieces school is a rarity that it doesn't put up with any of that shit.