“However, if a ticket scalper needs to spend 0.0001 € in power to buy a ticket that they will later sell at a 200 € profit, this will not stop them.”
A scalper making 200 euros a ticket will happily pay a fraction of a cent to beat a CAPTCHA. Machines solve them cheaply and low-paid human solvers fill the gaps. The alternatives work by profiling everything about the buyer. Events now pick between bots and surveillance.