Although the OU includes disposable baking tins and Star-K (pg 5: "All disposable foil products may be used") as things which don't require a hechsher for Pesach, it seems the OKOK would require a hechsher as they write,"Aluminum foil pans may be coated with a substance that is problematic for kashrus. Kosher consumers should purchase foil pans with a hechsher OR burn out the pan by inverting it over an open flame for approximately 20 seconds" for year-round use.
Personally, I've heard from various people in the kashrus industry - not any one particular hashgocha - where there's a demand, kashrus organizations will give a hechsher on products which don't necessarily require it. That certainly doesn't translate into the Badatz's hechsher as GershonGold quoted solid reasons. Nonetheless, at one of the kashrus sessions I attended a couple summers ago, they shared a real story of Fuji Film wanting a hechsher on their film...when asked why, the company said, "Our marketers tell us putting the kosher symbol on our product will boost revenue." If people will look only for kosher for Pesach tins, then you now have a money maker!