Surely if a trader has a problem with a supplier, then that's just between them and no one else's business. If they don't like the supplier then go elsewhere, source a cheaper or better product, do your research and better your company, just don't go pissing and moaning and ruining things that other people have put the effort in to organise a group buy.
I've had issues with some traders on here and instead of moaning about it I just don't give them my money.theres plenty other traders that are genuine and go out of their way to help you so they will get my money every time. If you be a dick, it's going to catch up with you and your business will suffer