The biggest challenge with B2B advertising is that after a buyer clicks to send an Inquiry email, the data trail ends—advertising platforms can only record views and inquiry clicks, not which products interested the buyer, what the quote outcome was, or whether they added items to a cart. The root cause is that traditional B2B websites cannot display different prices and trading conditions to different customers; essentially, everyone sees the same public page, and behavioral data cannot be matched to customer identity. The solution is to let buyers log in and see products, prices, and MOQ customized for them. This way, all buyer behavior within the catalog can be recorded, and advertising ROI can be tracked from "how much traffic was driven" to "how many orders were generated," creating a complete digital loop.