I'll try to give some other analysis as I see it.
First I think the business idea is definitely worth a shot. Others have questined the value-add of your idea, but I think it has merit. I am not sure other businesses know how or want to spend time learning how to sell their stuff on eBay.
Actually I think there ARE business who would love to sell overstock items but don't have the internal know-how of eBay/net sales and don't / won't spend the time learning it. So your value to them is that you make it easy to make some $$ on items they otherwise would have sold at a loss. Having consulted for many businesses I can tell you they'd be delighted if you could reduce their write-offs/markdowns for them.
Bottom line? You don't know for sure until you go out there and try. And even if it doesn't turn into a pot of gold, you have learned a LOT and can apply that learning to other ventures in your life. TRUST ME this learning is worth the hassle!
Here's what potential weaknesses are, and maybe your classes at IU -- which IS a top MBA program -- already taught you this:
1) It is an easily replicable business. If/when other people learn about this idea, they can copy you penalty-free, because eBay is so easy to use. There are few startup costs, you have no patents or other IP that would slow the entrants. And, if your clients learn how easy it is to do what you do, you may lose some/all of them since they may view your value-add as significantly low.
If other competitors enter the market, you may wind up competing on price, which is a tough position to be in. So your .10 may drop to .08, .06 etc...can you stay in business on low margins?
On the other hand, if you can keep what your doing low profile, create excellent relationships with your clients (so all they have to do is let you pick up their stuff and hand them a check) you may be able to stave off the competition for a while, and in the meantime develop another value-add service for your business. Or sell it!
2) It sounds like some of the businesses in your area deal in heavy or bulky items (thermwood, best chairs etc). Can you arrange profitably to have these items picked up/stored/shipped? Certainly these items can be and are shipped across the country, but it may require you learn some of the ins and outs of how bulk shipping works (including best rates, insurance, ship times, tracking methods, etc).
That's all I have for now. Go for it! And let us know how it goes!