all my tanks have equipment
my current silver is 230k
Just for reference: 67 total tanks
11 are light tanks I equipment cost= 5,573,000
25 are medium tanks I equipment cost= 19,760,000
16 are Heavies I equipment cost= 23,330,000
5 are Super Heavies I equipment cost= 8,300,000
7 are Tank Destroyers I equipment cost= 8,565,000
and 3 are artillery I equipment cost= 1,840,000
Total spent on equipment is: 67,368,000
so, yep that is why (took a bit to do the math, after checking every tank i own's equipment with filters)