Account-level budgets only apply to Sponsored Products. You can only control the daily budget for Sponsored Brands and Sponsored Display through campaign budgets.
Sponsored Brands (Headline and Video) and Sponsored Display have significantly fewer available placements compared to Sponsored Products. Therefore, in theory with more competitors, the bids will be more competitive. Luckily these Ad Types are not used as often as Sponsored Products.
Sponsored Brands and Sponsored Display do not have an impact on organic rank.
The goals for Sponsored Brands and Sponsored Display should be to profit unless the Brand is trying to obtain new subscribers or improve brand awareness.
ASINs that are "inactive" (out of stock, etc) will still run the ads for Sponsored Brands and Sponsored Display.
Sponsored Brands and Sponsored Display ads offer more creative control compared to Sponsored Products.