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I think he's referring to when the same user posts the same game for giveaway 10 times at the same time, instead of simply making a single giveaway with 10 winners.

He means people should use that feature and create giveaways with 5 copies instead of 5 individual giveaways.

It goes both ways though as you receive 1p for every giveaway created.

But this also increases the chance that the same person who really want that game entered 10 of the same giveaway will win again without noticing or doing something to avoid it, because all the giveaways end at the same time, and for that you can get some troubles or even get you suspended for not reporting your extra win...

But it is true, not using the "number of copies" option is messy and not optimal for everyone.