No, the forum is not strictly for IMVU. Any kind of artwork can be requested, bought, and sold here, as long as proper rules are being followed. (For example: adult content can be bought and sold, but not publicly.)
So, if you want to start a request for a logo, you can, but even though this forum is for all kinds of artwork, things outside of the imvu/oc/chibi spectrum are usually overlooked/ignored due to the fact that this forum is still heavily based around IMVU.
If you can't find what you're looking for, there are tons of websites out there filled with artists who design things for businesses and you can get them for cheap prices, too. As low as $5.