An interesting email. I note that the email is an invite to complete the questions. I would be tempted to NOT take any action and let the "invite" expire.
I am in no doubt that replying to this will not get you any benefits, rather may subject you to further scrutiny.
However IF they were to take the step and call me my responses would be as follows:
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From: eBay Customer Support Expires: 15-Mar-11
Hello,
If it is acceptable for you, I will ask you to answer the questions
below and then if I have further questions I will schedule a call.
Our questions are listed below:
Where do you buy your items from?
Clearance sell out from a liquidation company (pick one available on the internet)
Have you ever met your supplier?
Yes, his name is Bob and he is a dead nice bloke.
Do you have a contract with supplier?
See above
Have you pre-viewed these items prior to listing/selling them?
Yes
What shipping service do you use?
Royal Mail First Class, Royal Mail First Class recorded, DHL, Fedex,
Do you have tracking numbers for items you sent to your buyers?
Some but not all depending on item value
How do you process payments?
Paypal
Does anybody help you with packing and shipping your items/ answering
emails? If yes, how many people help you?
No
How do you handle returns?
Inspect them and then repair as required and relist as found following the inspection.
How do you plan to handle complaints?
In a professional and timely manner
Do you offer a warranty with items? If yes for how long?
If there is a manufacturers warranty on item then I personally honour it.
Do you plan expanding your sales on eBay? If yes, do you have business
plan for future trading?
Yes
Have you ever owned/started a business before?
Yes
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In my opinion ebay is simply a platform in which we use to sell items and we pay quite high fees for this "platform" I would not feel the need to provide details about my business as its none of there business. If they dont like what I am doing then they can suspend me, but as far as having a 1 - 2 - 1 buddy chit chat with these clowns, in my opinion they can "go forth and multiply" | 
