Sometimes I want a new premium tank, but nothing premium interests me. I'm sure I can't be the only one in this situation. Rather than being limited to the small selection of premium tanks we should be able to select a tank in our garage and pay to grant it premium benefits. The cost should vary depending on tier but be available for every tier that currently has premium vehicles. So tiers 2-8 would be eligible for upgrading.
Upgrading a KV-1 could cost 1750G. This is the gold price for a Matilda BP which is currently the most expensive Tier 5 heavy. The upgrade should give it the bonus to XP, credits, and allow it to be driven by any Russian heavy crew without penalty. If paying customers could pay to drive whatever they wanted to instead of being funneled into the small selection of premiums I'm sure we'd see a lot more diversity in matchmaking and see many more tech tree tanks in battle. I think this would be great for the game.
Source: https://www.reddit.com/r/WorldofTanks/comments/tsahnh/we_should_be_able_to_spend_money_or_gold_to/