Your ultimate aim through online marketing is to maximise your profit and make tons of money through affiliates.
sales funnel does the job if done properly. How if you do not think and put time and effort to put it properly together, it will be frustrating as you're not going to make any money with it. And because of that you can be put off from creating any more squeeze pages in the near future and end up creating 'buy only' sites.
With proper funnel and proper pricing, you are going to make money faster.