You can get infinite VIP very, very, very easily.
Step one: Create a nutaku account
Step 2: Do the referal with a VPN on that account so you have 500 nutaku gold (you need only 3 referal if you started with a refered account).
Step 3: Buy 10800 diamonds
Step 4: Level up lvl 10
Step 5: Change faction to your main account faction
Step 6: Enter the guild of your main account (or create a temporary guild with your main account for that purpose)
Step 7: Gives the diamonds from the reroll to your main account (find a zone, get your main account and your reroll there, click on the warcamp, find your main account from the reroll perspective, you can gift from there).
It takes between 15 and 20 min to do that.
Do that 8 times, and you can buy 4 months of VIP. And from these 4 months of VIP, you will get 120*400 = 48000 diamonds (so you need only 3 new accounts for another 4 months).
This trick is pretty broken tbh. The "free" diamonds are not transferable, so I bought some lvl 50 blue tools and sold them to my main account. I have a stash full of blue/yellow/purple tools lvl 50 and 4 months of VIP without spending 1$.