@lego
#1- That's a decent point. when members can see that each other is willing and active, it makes it easier for them to be active themselves because there is a standard of activity that they can aim at. And just being more active often leads to being more productive.
#2 - As Keanfox points out, sometimes you just don't have the skillset, or rights to the entire work, to complete a collab on your own, but in cases where it is possible, that's a great mindset. Although I agree it sort of leans away from being called a collab at that point depending on how much work you have done yourself.
It's probably a good idea to have made a small thing (manga/story etc) from start to finish on your own completely anyway, no matter how bad, to show yourself that you have the focus and resolve to finish a project. if you can't even do that on your own, how on earth will you do it in a team.
@keanfox yeah communication is definitely important. better to be told that someone won't be available than they just disappear without warning.