I used to be addicted to the Coke Brand when I was a kid.. where you?
Click on image for large view
If you plan to get a logo made for your business get a good one and keep it for as long as you can. There is a thing in the industry called "Brand Equity".
The best way to calculate your brand worth is to add up al the hours you spend on customer service with all your marketing endeavors over the years to get an idea of the real value of your brand. A logo is often an emotional reminder of the experience that a customer has had so the better the experience the stronger the emotional (Brand) value a client has when viewing your logo, color or word mark. For an in-depth look at this formula check out this link to a Stanford Study.