eBay reduces the commission from sellers. The Average Selling Price goes up. Why?

I guess because sellers can spend more time. Let's consider reducing commission in an auction - if a customer is supposed to pay $1 for 7 days instead of $2 for 7 days, she is more likely to spend more time i.e. 14days instead of just 7 days. And because she has more time available for auction, she would set minimum price to a higher value than before.