[Quiet Man Cometh]

Buyers (like me ;)) tend to like it better if you multi-pack or combine shipping. Shipping and handling charges seems to be where most people stuff the extra costs, to the vexation of the people buying things. Seriously, flat leather wallet (more like a billfold) 99 cents to buy, shipping costs $10.00. Mean.

Bundling would mean less work I imagine, and possibly less of a ding from ebay depending on how the math works.