Hello '8707michaelm',
Winning an auction or clicking to "buy" an item and then not following through with payment
is considered really poor form on ebay.
You have a low feedback score and are therefore likely unfamiliar with ebay policies.
Have a look at the following link about ebay's position on unpaid items:
http://pages.ebay.ca/help/policies/unpaid-item.html
So yes, your choices now are either pay for it, or get an Unpaid Item Strike on your account.
Sellers are able to automatically block people with 2 or more strikes, and given how infuriating it is
for them to have people 'buy' and not pay, most all sellers do it: