That is a big part of it. In fact it depends on your product or service.

For example OGnasty my first customer there.. i explained to him his target audience will mostly come from people searching Google.

We need to find them when they are searching for his service.

Although, with free token offers for example..  http://blogforbitcoin.com/wcx-low-cost-exchange-get-50-free-tokens

This one can generate sign ups right away.. and does not really need search traffic to get sign ups.

What i am offering is to make a money making page promoting your product or service.. and then i will go promote that money making page on my network of social media profiles and blogs.. so it gets lots of traffic and ranks in Google.