Just throwing something out there...
While it's obviously important to build a list, there might be some instances where this might be less profitable. If you're in a niche with tons of backend products, then it's probably good to build a list so you can keep throwing out offers.
However, there are some niches where there are no backend products. For instance, once people buy an ebook on getting rid of acne, that's probably all the money they are going to spend in that niche.
So instead of making a squeeze page in certain niches, it might be a better idea just to send your visitor straight to an offer so they at least see it and have a chance to buy. Because the best squeeze pages only convert at about 40%, that means a big majority of your visitors won't even see your offer if you put a squeeze page in front of them first.
'Blocking' these people with a squeeze page might turn out to be less profitable for you.
However, putting someone into your autoresponder series also allows you to follow up with them, even if it's just for the one product.
So I guess there is no right answer, you just have to test.
Any thoughts or experiences on opting not to build a list?