It take's like 5 seconds to make a spare account. And 100 identities wouldn't be tied together anyway? You'd ban 4 at most in a given run because that's all that was on the order.
As discussed in that Reddit thread, like Meta and PayPal, SDCC only allows for one account per person. Like Meta and PayPal, SDCC actively tries to identify duplicate accounts and deletes them. They even said as much in the violation letter they sent out to that person "all your memberships have been cancelled."
"Only one Member ID is required per person. Please do not attempt to create multiple Member ID accounts."
"Multiple registrations will be deleted."
"SDCC will periodically review all Member ID accounts, and if duplicates are found, they will be automatically deleted."
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LoginEven per that reddit link you sent, they could participate in open reg so it wasn't even a ban just a cancellation.
As per that violation letter. The current year's badges are cancelled. The violator is banned from attending the following year. After that they can participate in open registration again.
Paypal isn't banning anyone for selling tickets, especially not since they're associated directly with eBay anymore. Ebay also isn't banning you unless you are a many time multiple offender. I'd know, I've had stuff pulled multiple times before on eBay and my accounts still intact.
PayPal does ban people for transacting restricted items. If you read the countless posts about "I've been permanently limited, I didn't do anything wrong!". Right after checking if someone is 18 and over, the next question is whether they transacted a prohibited item. The reason PayPal may give you is "Some of your products or services are in violation of the PayPal Acceptable Use Policy and you can no longer use PayPal".