Hi. 3ncryptabl3_lick is right. Your online header or logo design is pretty much an important pillar of your online selling strategy so it beter be done well. The moment it accomplishes the task of making the viewer's focus stay a bit more on your site, then is very much worth the time/money investment you put on making it.
The reason why Desgnr is asking for the idea behind the actual business is simple: it determines the main purpose of the logo/header.
The moment you mentioned "online SELLING", the gears started turning. Trying to catch the attention of what kind of market? Professionals? Yuppies? Or the new frontier Disney has opened: tweens? What are you selling anyway?
The answers to these affect the decision of whether to make your own logo or get it made. If you are good with graphics (enough for the task at hand you realize), knows the software that can do the job, and has a lot of patience (and time), then you could do it yourself.
On the other hand, getting a logo design made from online companies such as LogoDesignGuru.com is a lot easier, not to mention that professional logo designers have experience on how to catch the attention of your target market.
So decide with these points in mind, and I'm sure you can arrive with a solution that will work for you. Good Luck OK?
