In the US, yo get ID verified you submit your SSN and I think your DL (may have to fax) I'm not sure how it is in the US.
None of my accounts have been ID verified, I got grandfathered in by having old accounts.
When you say number would be helpful, what do you mean? Unlimited means unlimited.
Well, seeing how I no longer sell crap and all of my accounts are in great standing I'm not worried about being suspended for no reason. Contrary to popular belief, ebay won't just arbitrarily limit you for "nothing" thing is always a reason. Granted, sometimes the reason may not make sense to the seller, and if this happens and the seller honestly was not doing anything wrong, or so they thought.. these suspensions can be fixed by simply chatting with or calling ebay's CS.
I have never suspended for doing things right.
I always got suspended for doing things wrong, and my first reaction was "what the hell ebay, I'm not doing anything wrong why did you suspend me!"
If you business is legit, you have nothing to worry about, simply as that.