You might be leaving money on the table
While most convenient, first- or last-touch attribution models often favor only certain kind of campaigns, ignoring the help of others.
A customer might first learn about your product on Facebook, click on the ad and end up on your Display Ad retargeting campaigns. After a while, the need arises for them, and they remember how perfect your solution is to them. They won’t find the Facebook or Display ad anymore, but instead run a Google search. Both first- and last-touch attributions would be grossly imperfect.
That doesn’t mean though that it’s always the best course of action to run Facebook ads or Display retargeting campaigns: they might be just too costly. But unless you put some effort into knowing it, you’ll be making decisions based on fear and intuition.
With Attribute, you’ll know exactly how much bang each of the investments give.