While you can get software to manage your bids for you, I'll recommend you manage your accounts manually - here's why:
1 - there aren't THAT many actual, peforming PPC outlets to choose from, so it's not like you're going to have to manage 20 or 30 accounts
2 - in my experience, having used this gear years ago, it takes as much effort to set up and monitor the software, as it does to simply log into the accounts and manage them - I used to manage almost 2,000 phrases in 3 different places, each place with 4 accounts (we ran agency accounts to allow this)
3 - unless the application manufacturer has a proper relationship with the PPC provider, they could easily make requests outside the limits (which will differ for each PPC provider)
4 - if they actually have the bona fide relationships in place, which some do, you'll pay more for the software - why pay more for something you can do on your own for no cost?
5 - many PPC providers simply don't like automated tools reaching into their systems - they prefer the slower pace of humans manually doing the work - less load on their systems
6 - they are one more place to make a mistake that allows the PPC system to cost you money - EX: you set the max spend per day in Google at $100, but decided to limit that to $50 in your software...except you made a mistake and entered $500 in your software. Google will happily suck the $100 max limit is sees on your account for the day.
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