Good evening Eran,
Thank you for bringing this to our attention.
I am not sure if you are looking to hide the tickets quantity for only a few events or if you are looking to do so on only a few events.
Depending on what the answer to that question is, the solution might vary slightly.
One quick solution would be to hide that quantity via CSS by using:
.tribe-tickets-remaining {display:none !important;}
That will hide the quantity for all events. If you are looking to hide only specific ones you could add a postid class at the beginning of your CSS rule.
Let me know if that helps.
Have a great day!
Geoff B.