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roitracker - 5:45 pm on Aug 6, 2003 (gmt 0)
I think this is a good method, since it means that your service will be completely transparent to your clients (which is always good practice). It has the additional advantage of solving potential cash-flow issues.
Many get the client to set up the account initially (so it's the client that gets billed by the PPC), and charge a management fee (fixed &/or a percentage of spend).