We don't support Min. Quantity for Event Tickets, so all tickets you sell need to be the same price.
The main reason is
consistency of how pricing has worked over the last several versions.
There are also implications on having different "tiers" or "levels" of
tickets linked to the same product.
If you have a Gold, Silver and
Bronze level tickets, and you give a discount when more than 10 tickets
are purchased - does this mean 10 overall?, because Silver and Bronze
are probably already discounted, and you could buy 9 Bronze tickets to
get a discount on the more expensive Gold ticket that you may or may not
want the etc.
You would need to customize the code to support this.
See https://github.com/odoo/odoo/blob/15.0/addons/website_event_sale/models/product_pricelist.py
Did you find a solution for the subject?
Please see my answer, we don't have a solution at the moment for this.