I believe to purchase items in Ebay, buyers don't just look at the price of the items but also the postage. However, buyers should involve the overall cost instead of just the postage cost.

For example:

Seller A sell item at $8 and postage $2. Total is $10

Seller B sell item at $2 and postage $6. Total is $8.

Sometimes it is cheaper if buyers have an overview of the total, althought postage cost is higher. Buyers tend to turn off when they see expensive postage cost. Buyers, please do not do that as you may be the same quality item at a higher cost.

Have a careful overview before turning sellers off.