From the comments below, it appears that the user (purchaser) is required to deal with the Esellerate Corporation, either as a condition to buy or a condition to register or both.
Developer, is there an option to purchase/register without having to deal with Esellerate?
Esellerate installs an application called "Esellerate Engine" without the users knowledge or consent. Esellerate engine 'phones home" without the users knowledge or consent unless the user uses a means to intercept these insidious actions. Viruses, trojan horses, and other malware are other examples of applications installed without the users knowledge or consent.
One recent application I bought uses esellerate to phone home prior to each and every use of the application, otherwise the application won't run, even if the user is away from internet connectivity. It is none of any esellerate employee's business when, where, and how I use my Mac. I've been unable to persuade that other particular developer to allow me to circumvent esellerate's "phone home" requirements.
Advice to all developers: (1) Provide customers an option to pay and register without the involvement of Esellerate, or , at least (2) Warn potential customers of the requirement to use Esellerate.
I'll buy in to Temporis if there's a way to do so without involving Esellerate, otherwise, not me.