What is a reasonable amount to spend on Pay Per Click advertising?
Am launching a website to sell glasses and the client would like to use pay per click advertising to get going. I expect they will want to use PPC for the first 6 to 12 months. How much is a reasonable amount to drive people to the site?
I suppose I'm asking based on experience of what clients usually expect as I know it's down to how much they are willing to invest and what the ratio of conversions is.
Also, what are the best pay per click services to use?