Laura sounds like an interesting assignment. I work in IT so can't give you any direct information but .....
Consider more than just ebay, how has the current trend for television affected the antiques industry e.g. flog it, cash in the attic etc that has made us all aware of Clariss [?] Cliff
Do a PESTLE analysis on the sector to see what else might have affected it, both internally and external. Include a SWOT analysis on the business model. Include a bit on handy's frog (organisations avoiding creeping change) etc.
Crikey .. I feel an ebook on management models coming on .....
Graham