Pay Per Click services [PPC] such as Google Ad words will bring more traffic to your site! However as this is an on-going cost, this will have a direct impact on your profits.
Costs for using PPC for Search Engine Optimisation, can vary enormously depending on the type of products or services your are offering and the Geographic location of your market which can either be in the UK or World Wide.
Cost Per click [CPC] - fundamentals
Relatively simple to set-up, SEO using CPC campaigns require some thought. You decide on the monthly budget, but choosing the correct key words will save you £'s in wasted revenue to Google
Often deciding how much you a willing to pay for each click, is difficult and time consuming. How do you know you are getting value for money? And how do you know if your key words are bringing you the return you are seeking at the most cost effective price.