Home & Style Market: EBay’s long reach

New brief this week from Center for Media research on how eBay reaches as many home & garden shoppers online as industry heavies (and major advertisers) Lowes, Home Depot and HGTV.
Demographics of this audience are over 45, household income of $50K or more, 59% female–in short, the subscriber base for many established women’s magazines.
I’d like to see someone analyze the sellers’ base on eBay and report on what kinds of vendors and categories are aggregating the biggest set of purchasers/volume of sales–does eBay have selling power as well as reach–or is this an eyeballs play?