Posting my year 2017 stats here to complete this thread for me.
1. Bought 11 (daily wear) bags and kept 9 of these
2. Bought 2 travel Longchamps (not counted in my tally)
3. Bought 2 document bags (1 nylon Longchamp and 1 Fossil leather; again not counted)
4. Sold/gifted 14 (including the 2 bags bought on same year)
I'm around 38-40 bags now though admittedly there are a few bags I don't count like some clutch/evening bags, document bags and some Longchamp nylon bags of different sizes/types. I think there are just 3 Longchamp nylons that I include in my count.