Uncollectable recivables are a small percentage and OMC will not carry them as recievables past 1 year. They (small %) become a write off under uncollectable. Read the report. What's wrong do you have ADD. What about the Carribean.
The goodwill and receivables numbers are consistent with Omnicom's primary competitors, IPG and WPP. They are also consistent with the historic numbers, increased by growth in the business. It is no surprise that a service business does not have hard assets.
Your real issue is that you don't like the advertising industry or service businesses as investments. Fine, but advertising is not going away.