Ebay information scamming

This made me just plain mad. I found this survey in my inbox this morning and filled it out and then hit "next" and got this screen:

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"Thank you very much for your interest but the survey you were contacted for is already full. We value your opinions and hope you will continue to participate in future surveys."
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I sent an email telling them I think this is a form of fraud and cc'd the Surveymaster at psbwebsurveys dot com. I wonder if I will hear anything back.

If a survey is EXPIRED the day after you get the email, wouldn't the survey tell you BEFORE it fished you for all the questions it wanted answered?


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The bait:
From: invite@survey.ebay.com
Subject: ************, eBay would like your input
To: *
Date: Thursday, June 9, 2011, 2:49 PM
eBay eBay sent this message to *. Your registered name is included to show this message originated from eBay. Learn more. *, eBay would like your input
Dear *,

Thank you for taking the time to complete this survey. This is your chance to tell us what you think about fashion and shopping on eBay so we can do a better job of bringing you what you want. Also this is your chance to win one of the five $50 Visa gift cards!
We'd love to get your insight on shopping for clothes, shoes and accessories, and invite you to take a short survey to express your opinions. Your input will help us make eBay easier and more enjoyable to use.
To take the survey, please click the link below or copy and paste the link into your browser.
http://www.psasurveys.com
Once you have completed the survey, you will be entered for chance to win! Official Rules
Thanks for being a part of the eBay community, and we hope to see you on eBay again soon.
Kind regards,
Consumer Insights Team

How do you know that email is from ebay?