It can happen. You are bidding on Google Adwords, Overture, Kanoodle or whatever is your favorite PPC engine. And, next thing you know your costs skyrocket. You are out of money before you know it.
This is a growing trend and it can come from a competitor clicking away on your ad. Or a nefarious software that stealthily bangs away on your ad links while your dollars disappear.
What is a Realtor to do?
That is exactly what an Oregon insurance company did when they found they were getting clicks from the same IP address.