Just some inside numbers from the 405th Source Pepakura Hub - Top 5 Downloads:
1. Halo 3 - Mark VI HD Helmet DF4L - 3,359
2. Halo 3 - Mark VI HD Chest A4 Flyingsquirl - 1,773
3. Halo 3 - ODST Helmet NZ-TK - 1,762
4. Halo 3 - Assault Rifle A4 Flyingsquirl - 1,451
5. Halo 3 - Sniper Rifle Letter Rvb4life - 1,1135
So yes, people are marking Mark VI's - however .. for those of you who suck at math let me point out the obvious - 3,359 helmets, 1,773 chests... and all the other limbs don't even make the top 5 tells us that very few are actually finishing them. INFACT, combining my vast knowledge of all the members I've met personally at all the major conventions, along with the complete suit topics we have in the 405th Discussion area. The best guesstimation we can make is there is around ~75 full suits in existence from the 405th. The real total is impossible to tell due to there are many people who build their suits and never document it PLUS the original Nightmare Armor suits. There was that dancer group that recently performed so you'll need to add those in as well. All in all there are under 100 in existence we can actually account for. Kind of amazing for the few of us that actually do have a full suit.. and kinda puts it in perspective for you where the information is all stemming from.
Cheers,
Kensai *proud owner of 2 Mark VI's [created 3 total]*