As eBay's senior manager of seller advocacy, Jim Griffith gets a daily earful about what's wrong with his company's online marketplace amid the ongoing wave of changes implemented there.

Sales Tips from eBay's Ultimate Insider

The ever-shifting online auction environment means there's always more to learn and new tactics to try in an effort to bolster sales on eBay, whether you're a veteran of the auction wars or an eBay greenhorn.

"Before starting an eBay business," says Griffith, "make sure you do extensive research on the market you are intending to enter, in the [auction] category you are intending to enter."

"Your follow-through has to be good from the start," Griffith says.

Being overwhelmed by those responsibilities can be devastating for sellers, because it will almost certainly lead to low ratings" from buyers.

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