I agree with several posts here.
If I'm putting the effort into DMing I expect people who agreed to show up and game initially to stick to their guns, especially if I'm only running a 4-5 player group. Don't get me wrong, real life happens, but missing several consecutive meet-ups is inexcusable for how much time and effort I am putting into the campaign for all of our enjoyment. On the flip side, if I were running a larger group, it would be insane to think I could have everyone present all of the time, so absences would be excused as long as a vast majority of the group was there.
I have no reservations about progressing the story without "essential players" present, but I have noticed since 2005 when I started DM/GMing that if you do it too many times (because they are missing sessions for various reasons) they are not only going to lose more interest but they probably already have.
A lot of people take GMing for granted, so much so that it's probably the main reason roleplaying isn't more popular than it already is. Someone has to "take one for the team" and spend precious time and even money on getting these things organized and presentable while everyone else gets to show up (or not), roll dice, and complain that things aren't going their way. I imagine a lot of GMs have given up simply because their play group or individuals therein are completely unappreciative or supportive. I mean, if you're saying "Yes" that you'll join a campaign and you're going to show up weekly, you need to follow through. You're basically entering into a friendly verbal contract saying that you'll put in the face-time with the GM while he puts in the hard work for you.
So, it really confuses my why my current/former GM would want 7 players in his group but wouldn't run a session without ALL OF THEM present. He is lazy, so if someone just so happened to call out, it gave him the excuse of not being able to run the game that evening. I mean, it's not like he ever had more than the first session planned out (for the last few times we met, he just threw together an encounter using an encounter builder program, and said "go!").
Either way, I have now recruited him as a player (he at least always shows up when he is a player) along with a few other people already for a Mass Effect campaign using the Star Wars Saga Edition rules.
Which ironically brings me to my next point. I discovered the other night after a bit of searching the intarwebzz that the Mass Effect PDF I put together on the Wizards boards a few years back got around quite a bit, and found its way here to the EN World boards! I was even seeing comments here that it was "very well put together". It made my day reading that! I put in a TON of hard work compiling all of the posts in that thread over at WotC, refining them a tiny bit, and slapping them into a somewhat-organized PDF. I'm actually working on the Version 2.0 of that document that edits for
consistency, grammar, spelling, and fleshes out a lot more of the abilities and enemies, and even adds Manufacturer templates to weapons and armor for the 20+ Manufacturers there are in the ME setting. I have a decent amount left to do on the document as a whole (roughly 30%) but my players are dying to get going, and I happen to have a ton of spare time at work while on the night shift, so I think I might crank it out over the next few weeks.
So thanks for the kind words, and thanks for the advice in this thread!