I've done a 5-person in the past, and I'm not up for doing it again. I'd only be interested if someone was putting together an 8 person team. Last time I was on a 5-person team I had back spasms.
Last time I was on a five man team, I got hypoglycemic on a climb, saw a bunch of yellow spots and crashed into a tree on my 5th lap. Luckily Adi lent me a gel which got me to the finish or I probably would have passed out in the middle of the trail.
6-10 man is way more chill as you can take the time to socialize, watch the concert, and visit other campsites. 4-5 man team is rough because all you do is eat, race, eat, eat, eat, race, etc.
I'm racing with my shop Oakville Cycle and Sports again this year. U of T riders drop by for free bike tuning, we'll have 4+ mechs on hand and new for this year: an MD.