Bidvertiser & AdBrite limitaitons

Guys
I have a website www.globalcashsite.com and tried to add Adbrite and Bidvertiser ads on this site along with AdSense ads those are already working here.
My site is not specific to one topic that is related to Investment, Banking, Loans, Debit, Mortgage and then later AdSense, make money at home and every thing that is need to make money from home.
AdSense is great because publisher don’t have to limit website category. But in AdBrite & Bidvertiser I have to select site category so these PPC network may show ads related to selected category.
My problem is if I set my site category to Finance & Money then later related ads will not show at AdSense, Marketing, Make money related pages. This is same in AdBrite and Bidvertiser.
Limiting site category is not good idea. What you people say what is your experience regarding these?
GCS

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