The only issue with freebies is that someone might choose to hold off in the hope of freebies, denying the club a sale.Nothing else is an issue for me.
Other than that I have not met anyone unsatisfied with them.
Child tix have been free or a fiver for a while, and it made me and my dad visit more often, and the club shop probably got more purchases as a consequence. If that happens just once a year more often than it otherwise would, that's two adults (one senior), tix, plus tea, plus purity , plus snacks, (nothing for me to drink so it's just tea) plus a random club shop spend. In reality it probably happened more often extra when my daughter was younger as it gave my wife a break.