Research by eBay Inc. has found that the average consumer will use as many as three to five devices or platforms in the course of making their buying decision and completing a purchase.
This tendency to hop from device to device during the decision-making process greatly increases the risk to retailers that a customer will, intentionally or otherwise, not complete a purchase.
The research also found that a quarter of online and mobile purchases are made by customers who could not have bought the products locally, with these purchases accounting for €9bn worth of sales in the UK alone in 2012. - eConsultancy
You can only track shoppers across multiple devices or platforms if you can identify them on each device.
For example, if you have 20% identification (which might sound OK), the chance of following a shopper across three devices is 20% x 20% x 20% = 0.8%, which is useless.
But if you have 60% identification the chance of following a shopper across three devices is 60% x 60% x 60% = 21.6% which is still useful for remarketing.
So you need the best identification rate that you can get.
It's not enough to require shoppers to login before they are tracked. You need a system, like Fresh Relevance, that combines multiple identificiation strategies, such as:
Do all that, and you can get identification rates above 50%, which will get you great remarketing results.