Does BAT Go Up if Brave's user base goes up? Help

I’m having a hard time understanding what affects the price of Basic Attention Token. Will advertisers have to use tokens? What makes it more valuable? If more people use Brave Browser, does that assume the BAT token will increase in value?

If any advertiser is paying $500 a week when BAT is worth .20, Will they still pay $500 a week when BAT is worth .4 or will they now be paying $1,000 per week?

Where can I look to better understand the actual supply/demand/price relationship of BAT to Brave?