Shorts have been saying sell since the beginning. Just take a look at any time in the past. Anyone saying sell does not understand Ebay the business. I've been selling on Ebay for 2-3 years. This is a money making machine and only 5 years in the making. I don't know if now is the right time to buy but why not. 10 years down the road will it really matter when you got in? As long as you get in, you should be happy.
Donins... all those requirements that people was adhere to are stated in a contract or buyer's agreement form(s). The underwriters of EBAy-I think it is Goldman Sachs- probably bought a few shares before offering them to their account holders. After that, they sell to the public. Of this offering of EBAy, I surmise that there weren't much left to offer to the public! Thus, the IPO is the official date where all the public can participate.
A month? Yes... To keep the stock from falling below IPO levels... or just to keep it at the 40-53 levels. Thus, not much selling is taking place while lots of buying is taking place.
Can people short sell now? I am not sure. You should be able to do it. Talk to your broker about it. If you are using a discount broker, phone them up. They must have a REAL broker that are willing to take your calls. Just tell them that you are interested in short selling EBAY shares first. Then... they'll talk to you :).