Drop in traffic after submitting to Bing webmaster tools?

Experienced traffic drop after verifying sites

[Slashus]

I had 50 or so relatively new websites to care for that were in Bing's indexed and getting traffic (all on the same host and IP). I decided to verify them all in bwt and submit the sitemaps for each one. A day or two later, all the Bing/Yahoo traffic just kind of died.

Coincidence or does Bing not like adding sites enmasse?

[Bewenched]

I think it takes time for them to "re-evaluate" your site and it's intentions. We're doing fairly well on Bing and have them downloading our sitemaps every couple of days.