Your sales funnel begins as the wide end. This is where you want as many qualified people as possible to enter, so this is where your marketing happens too. Whatever marketing method you’re using to get your qualified entrants, your key aim is to get people to opt in. When that happens they are entering your funnel.
Part of opting in is that they are allowing you to communicate with them. Now, even when you’ve used some means to qualify people who opt in, you will still get people not qualified to go through your funnel. So, focus on those who show an interest in what you have to offer. These are the people you want to keep, going through your funnel. If you lose someone who has shown no interest, then you haven’t really lost a potential customer as they would be unlikely to buy from you.
The very front of your funnel is not the place to make money anyway; you simply want to attract people into it. The back end is where you generate revenue and profits. The people who will provide you with those profits, in exchange for your valuable and useful offers, will opt to take advantage of your free offers in the funnel, and then less costly items. And these lead onto your more expensive, and more valuable, products.
Your funnel has another advantage in that you can do an analysis of every move in it. That way you can see where your best to develop and optimize it. In this way, even though a funnel gives you more focus in your business, that focus increases as you gain more information over time. And therefore your productivity and your results.