Cheryl, you are probably right...

If you watch the news or just about any show in the evening. There are always tons of adds from pharmaceuticals advertising anything from Chicken Pox to Advair to Prolosec and many others. I counted in 2 hours the other night 9 different pharmaceutical advertising between 7 and 9 pm on ABC alone.

If one these networks ever took the iniative or gumption to do a well researched broadcast on the dangers of vaccination I'm sure they would loose millions in advertising revenue from Prime Time alone.