Unfortunately you can't please everyone Alberto. The 8 pins rule creates a lot of arguments, as you are saying. However please look further into the event and see how good value it is. You won't get much better value anywhere. So whether you are giving a lady 8 pins or not, great opportunity to play 7 games competitively against top bowlers (men and ladies). As Lovey says, The more you play against and with higher average bowlers the better you will get.
Also there is never much on for bowlers to play competitively, so this is to provide an avenue for keen bowlers.