Why does an ebay seller want to manually send an invoice?

i'm looking @ ebay auction in buyer requested contacted separately if interested, , send invoice buyout price. ebay account has 100% positive feedback , invoice still coming through ebay, seems legit, curious why done way.

i'm looking @ ebay auction in buyer requested contacted separately if interested, , send invoice buyout price. ebay account has 100% positive feedback , invoice still coming through ebay, seems legit, curious why...

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