Guitarguitar would offer you half of what they would sell the bass for. I did it once a few years back and never again. I imagine most stores operate on the same terms.
Sell on here as it`s a trusted community or get Bass Direct, who will charge you 20% but are good on second hand sales or Bass Gallery who will charge you 15%.
I recently had a bass on com sale with the Gallery and it took them 2.5 weeks to list it and only after me asking where the advert was. The photos weren`t very good and sod all description. I took it back and 4 weeks later it`s still showing for sale in their Reverb shop, which is strange as it`s sitting beside me right now. The whole process just seemed very laid back. But that`s not everyone`s experience, just mine.
My mate sold a Ric through Bass Direct in a week, good photo`s and description.
If you price the bass correct, some nice photo`s, a good description and offer postage, which in these times is almost a necessity, on here`s a great place to sell.