1) How many kits (rough estimate) would you say you buy in a year?
It's been about 10 to 15 right now, I am still new to this hobby but I imagine it may grow overtime as I get better.
2) Do you buy a kit as soon as it is released or do you wait a while? If you wait, what's the main reason for waiting?
I wait, mostly because I have formulated a list of my own and won't get a kit until I'm ready for what's next on my list. I will stay about a kit ahead of my list. The list is roughly organized by when the vehicle was actually produced and I plan to do every variant I can. Here is a small example.
14. Sd. Kfz 222
A. Hobbyboss - SH $34.46
B. Mid Version : Tristar - GMW $47.15
C. Sd. Kfz 223 : HobbyBoss - SH $33.15
15. Sd. Kfz 6
A. 7.62cm Flak 36 'Diana' : Bronco - SH $62.65
B. 3.7cm Flak 36 BN9 : Bronco - SH $49.53
C. Personnel Carrier : Trumpeter - SH or GMW - $51.95
16. Sd. Kfz 7
A. Early Version w/riders : Dragon - SH $41.28
B. Initial Production : Dragon - SH $40.32
C. Late Production
1. Dragon - SH $44.21
2. Trumpeter - SH $39.40
D. 3.7cm Flak 36 : Dragon - SH $49.35
E. 3.7cm Flak 37
1. Standard : Trumpeter - SH $42.34
2. Armored : Trumpeter - SH $42.57
F. 3.7cm Flak 43 Armored : Trumpeter - SH $42.57
G. 2cm Flak 38
1. Standard : Dragon - SH $48.01
2. Armored : Trumpeter - SH $40.88
The SH stands for Scalehobbyist.com and GMW is Great Model Webstore.
3) Do you buy online or from a physical LHS or show vendors or combination?
I mostly buy online, unless I find a good deal at a show of LHS.
4) If you buy online, from who? (feel free to list more than one if you have multiple favorites)
As stated above, I am a big fan of Scalehobbyist. Their organization is amazing, you can narrow down you're search really fast via the left column which can be filtered by country, scale, model, maker...and the list goes on. Also, I've found their prices can't be beat, best online retailer that I've seen so far, always 5 to 10 cheaper than GMW, which is my second online dealer if what I was looking for isn't on Scalehobbyist. I will frequent Ebay to find any bargains or rare kits.