Taking The Fear Factor Out Of Paid Search For Small Businesses
Many SMBs with limited budgets run paid campaigns with great success. Small campaigns with a few long-tail, niche keywords may bring all the traffic you want. There is no rule that says you have to have a large campaign and whopping budget for PPC to work for you. The engines will encourage you to spend more, but the ultimate decision about the right amount of traffic and the extent of your budget lies with you.
From Internet Marketing PPC