Paypal Reporting Income to IRS with 1099-K. eBay Sales Over $20,000 AND Sold Over 200 Items

I was reading this article this morning and posted it in another thread regarding 1099-K

http://www.forbes.com/sites/kelly...taxpayers/

I know there are a lot of folks here who buy and sell (using Paypal to receive payments) based on slickdeals they come across. Some folks for profit, some folks, to get their item for free (buy 4, sell 3, get their slickdeal item free). I've been able to get some great deals going the route of buying a few extra and getting the item for free. However, with so many great slickdeals throughout the year and selling, for some, you may have cross the threshold of now receiving a 1099-K from Paypal ($20K gross received and 200 transactions) that is also reported to the IRS

http://www.irs.gov/instructions/i1099k/ar02.html

So, how does one handle this. Some questions that come to mind:

1. What distinguishes hobby seller from small business?
2. Reported amount is gross, not net, where is clarity to show just net income?
3. If you receive this form, and somehow show a result of net income, can you claim expenses, itemized deduction (mileage to acquire items, etc, etc.)?
4. Since this is new, how well are tax accountants prepared to help tax preparers to navigate this new form?
5. Should you create a new Paypal/Ebay account to account for selling personal items/friends items, etc vs items strictly for resale?

Wanted to open it up for discussion.