If the buyers bid and win and then later don't pay or buy, then the option for a negative feedback should be open, but in that case, how will the seller avoid the earlier 'tit for tat' negative feedback ?
I am in the favour or removing negative feedback for buyers but it should be only for those who use PaisaPay (which incidently I won't be using in future).
Other feedback method requires changes for both buyers and sellers.
Coming to transit damage or loss, it's upto the seller to choose the courier service by seeing their old records of delivery times, quality and reliability. Provide shipping insurance and ask the amount for it ! A buyer who leaves negative feedback with regards to courier service problems is entitled to do so since the choice of courier and packaging details rest with the seller. However I do agree that in the points this feedback should have a little lesser negative value than the negative feedback left for the seller itself.
Yes, for buyers the negative feedback option should be there but only for those who don't choose to pay by PaisaPay.