What would be the harm to open it for business sellers too? For instance all "charity shops" are classified as business. All casual sellers who are selling a bit more from home have been "forced" to be a business. Lots of business would like to see "old" stock go.....All reasons to make it available for business sellers too (and you can always not tick the box if you dont want too, but at least you have the equal opportunity to do so)

To do it one by one is a bit of a challenge, as its only for that auction and you have to do it over and over again. Hope TM will add this also in "my products" some day.