Hi Henning,
Thanks for reaching out to us and for considering our plugins for a client’s website.
Yes, our plugins can do all that. You will need the free The Events Calendar and Event Tickets, and the premium Event Tickets Plus for the listed functionality.
The easy administration is built into the core of our plugins. 🙂
Our premium plugins like Event Tickets Plus go on a subscription base, and the $89 fee (Personal) that you see on the website is the ongoing yearly subscription fee. This will grant you plugin updates and dedicated helpdesk support until your subscription is valid. You can read more details on that here.
I hope these answer your questions. Should you have any more, I’d be happy to answer them for you.
Cheers,
Andras