Apart from the nice fluffy feeling that you can acheive a 50 thousand word novel in a month, set a goal and acheive it, what do you get? Well apart from the normal ego there is a good reason to do it. Discounted software. A better reason to win or complete the goal you get half price off some well known writing software. Scrivener and Storist.
Merely writing a novel under pressure with a bunch of strangers, sorry fellow writers doesn't do it for me. But the fact that a Loved Family Member (LFM) has promised to give me their Air Mac when they done with it, has given me an good incentive. Yes, I'm using the pural, whatever.
Purely mencanary view and I feel bad though I don't know why is that I can get Storist and Sceiver for half price if LFM does pass it down. If fact LFM usauslly give me cast offs which are much treasured and used for years.
Last year I did take part and finish a novel called Deanna and managed to claim 50% of a PC based Scrivener.
I use Storist in my iPAd and I'm fairly impressed though I really mostly use iA Writer because I get a clear sceen.
There are other valid reasons for doing it. More honourable reasons - keeping to goals, knowing you can do it, that type of stuff. Personal achievements. Then again having something tanigible is always a good thing. So why not....keep it real.