It depends on where you set your bar. For some individuals (probably the bulk of Fyre Fest attendees) this is going to require explicit text.

Depends what they are shilling and whether the creators of the show would actually endorse those products themselves genuinely.

Like, I personally wouldn't have an issue endorsing something that I use myself, but I would absolutely be a sell-out if I did it just for the money. I'm not a salesman.