That's a nice trick, but I don't think eBay allows it:
>>Fees and Limitations
For a 10-day listing, there is an extra charge. All other durations are not subject to this additional charge.
Note: For eBay Motors Vehicle categories, the 10-day duration is not usually recommended.
For a 1-day listing you must have either:
A feedback score of 10.
A feedback score of 5, and have a PayPal account and accept PayPal as a payment method.
Notes: If your account does not meet these requirements, you will not see the 1-day option when listing your item.
Changing the duration of a listing - In general, you are not permitted to change the duration of a listing. The only exception is extension to a 10-day listing, for which there is an extra charge. For additional information, please see the Circumvention of eBay Fees policy.