I think I was [del]screwed over by[/del] at that one. Was it in Richmond, Texas?
Applies mostly to commercial (media) cons, e.g. Creation Cons. (Creation was an organization IIRC owned by Paramount, the Star Trek owners, who threw these “cons” as the official Star Trek events. They are just excuses to stuff as many people into a room as possible and shake as much money out as they can.)
Maybe not the same event. The one I went to, out of his 2 hour presentation window, he spent the first 45 minutes showing a video of some old radio show scripts that he was involved with them digging and reading through. They were running a whole video segment, not excerpts. That’s when I bailed. No idea if he actually got around to doing anything else.
Your descriptions are consistent with the commercial media cons, not fan-run cons.
Clarifying remarks in brackets, agreeing with your breakdown.
How much each guest does depends upon the convention, and the interests and willingness of that guest. Many of the media guests are trying to earn a living by their appearance, and selling photos/autographs. At big SF cons, they may appear in a panel event for Star Trek as a whole, a Panel Event for their particular show, a single event for them specifically where they talk about other things besides that one show. It may be a moderator question, or them giving a talk and taking questions. Whatever they are more comforable with.
They may also tie in to other programming as emcees, hosts, judges, etc.
General SF cons tend to have more creative panel discussions that are exclusive to just one show or book set or whatever. They will try to make creative ideas and cross-pollinate several panelists. These may be various authors, artists, or other contributors. If a media guest is willing, they can be involved in some of these.
Because the fan run conventions are on tighter budgets, they typically focus more on authors, artists, and maybe editors, and limit the number of media guests - perhaps 1 if you’re lucky. It takes a big venture (like Dragon*Con) to be able to afford multiple media stars.
I have seen a couple of smaller cons have a media guest as a main guest and use them well, but it is very easy for a smaller con to blow their budget and not recoup it that way. Having a “star” present has to create a substatial increase in membership just because that person is there that wasn’t already showing up. This is difficult to do without heavy advertising saturation, something I haven’t seen smaller cons do (in my limited experience).