Yeah, many original sellers (e.g. Nintendo, or toilet paper manufacturers) probably don't want to violate the law and/or alienate their customers.

Sometimes musicians don't want to price many of their (younger and/or poorer) fans out of the ticket market. I thought it was kind of cool when Green Day (for example) had a show that only accepted cash at the door. (Though I guess the wealthy could still pay people to wait in line or give up their spot, I expect that would be frowned upon by the other fans waiting in line.) Fan clubs can also help genuine fans buy tickets for themselves at face value, though they are also often exploited by resellers.

The counter argument that "increased prices will entice manufacturers to increase production, driving down prices due to higher supply" is deeply flawed. People cannot wait several weeks for production to ramp up, if what they need is water, medical supplies and so on.

The better way to do it is to apply anti-gouging regulations and purchase limits per customer.