Hmmm that's tempting, but I'll have to pass.
Assuming there's a 100 point code every month, you get 110 points per month for signing up and then we can assume that you will get 5 samples per month (to be conservative), which means you get 50 points per month from samples. So adding that together is 160 points per month. Times that by three (for three months) and you'll have 480 points.
110 points (signing up + 100 pt code)
50 points (5 sample reviews)
= 160 points/month
160 points/month * 3 months = 480 points total
Whereas with this code...
You get 200 points immediately, but then assuming the same 5 samples/month (again, being conservative), you'll get 50 points a month and that's 150 from sample reviews in your three month gift subscription. The total for this option is 350 points.
200 points (promo code)
50 points/month (for sample reviews) * 3 = 150 points
200 + 150 = 350 points total
EDIT TO ADD... you also get 30 points immediately for spending $30! (thanks @
@SneakyBurrito!) So the total for the ACES deal is: 380 points!
Of course, this model only works if there will be new 100 point codes every month.

/emoticons/
[email protected] 2x" width="20" height="20" /> (this model also doesn't work if you're being nice and actually gifting a 3 month subscription to a friend, haha)
Also I've never done a gift subscription before so IDK if you can gift it to yourself or not (probably yes) but if not, then your 200 points and 150 points would be on two separate accounts whereas the 480 points would be on one account. Regardless you'd still be spending $30 either way for three months of Birchbox!
(lmk if my math/reasoning is wrong! this is just my own musing hehe)