I too am a parent.
Try starting with a smaller amount. My son plays and I would have reservations about him doing $20 at a time. But $10 here & $10 there, much easy to let slide. You might even have to slip down to $5. You still get your prize mount, just for a shorter time.
If they allow you, at a lesser amount, you might try dropping hints about how much you enjoy it, just to butter them up for the next time. But you know your parents best. Some are easier to move than others.