If you deliver what you say you're going to deliver, and provide excellent customer service, negative feedback should be extremely rare for you.
I came across some fascinating information recently that reinforced to me how important it is to maintain the highest possible feedback percentage.
Most of us would feel great at having 99.9% feedback, or 99.9% as a grade for anything, but as the following stats show, 99.9% can be unacceptable in many situations. It's certainly sobering to consider.
So, these would be the results of 99.9% accuracy in various situations:
22,000 checks would be deducted from wrong bank accounts every hour
1,314 phone calls would be wrongly routed every minute
12 babies would be given to wrong parents each day in the USA
5,517,200 cases of soft drinks would be completely flat
2 plane landings would be unsafe at Chicago O'Hare every day
2 million documents would be lost by the Inland Revenue each year (no comment)
811,000 fautly rolls of 35mm film would be sold each year
268,500 defective car tires would be sold every year
2,488,200 books would be printed with the wrong covers each year
You get the idea.
Like I said, sobering to consider isn't it?
Feedback is a precious commodity that is your reputation on eBay. Do everything you can to maintain 100% or as near to it as possible. You'll stand out as different, in a very very positive way.