Fiavamianwa

I dont get it. Can I paint summer, winter, and dessert all to get all the 3% improvement of concealment? Or I can only paint one?

You CAN, however, get a second CREW. In the case of a special crew, like the Zero-Skill BIA crews, you can buy the tank again, get the gold and garage slot, AND get the second BIA crew to retrain for any other tank.

I verified this a couple days ago when I bought the ISU-122S on day 13. I got the gold and garage slot, but since I already had the tank, I got the BIA crew in my barracks....

I will watch out for other tanks with special crews (like the Cromwell B) from other nations to stock up on better crewmen. Since I'm buying Gold anyhow, I may as well get a bonus for it.

As every one else has said it gives you the gold equivalent plus the garage slot, the crew, and anything else if you get a bundle. Usually you don't save any money by getting gold this way, but if you want gold anyway it usually is a good way to get the extra stuff in the bundle or any special crew that comes with the tank for almost nothing.

Right, you get the gold value for the tank... not a second copy. This is why a lot of people keep their unused premium tanks that they may not play or need, because if they win them later or get them from missions or other rewards, etc, they will get the gold value plus the garage slot I believe.