I'm also glad you enjoyed your first seminar. Maybe your post encourages others to also visit their first seminar, wouldn't that be great?
I also, like Mayland, look foreward to attend a four day seminar (will be very intense, too) over the easter break (mine will be in England) with a 5th dan. I think what keeps me going to seminars is, besides the fact that you can learn a lot, the very special atmosphere at such a seminar.
Wishing you many enjoyable seminars,