Daniel,
I prefer to delete accounts I no longer use, so please inform me on how to do this.
I am administrator for the website of my diving club and I try to spend as little money on it as possible, so I use Joomla and free extentions.
I started using Seminar many years ago so our members could subsribe to club events and we liked it very much.
When Mr. Volnnar stopped the development the only real alternative at that time was Matukio. We decided to pay for this one extension as it was very usefull. And we enjoyed using it for some years also.
When migrating to Joomla 3, I evaluated all used extensions and found an alternative even booking system which is providing everything we need for only half of the price.
I understand that developing and supporting a Joomla component is a lot of work, but why pay more if there is a cheaper alterantive which is as good?