1. While this may be true in some cases, but it is equally possible that only companies with products that are already best-sellers can afford the higher ad rates that popular shows demand.

出处：

结构：While this may be true in some cases (under some circumstances/on some occasions), but it is equally possible that …

翻译：虽然在有些情况下确实如此，但是同样可能的是只有那些产品已经在市场上热销的公司才能支付得起“大众秀”所要的高额广告费。