Hello, I'm an AdWords user and I'm about to expand my PPC efforts over to Yahoo as well. I'm in the process of setting up my first campaign and I'm surprised to see that there is a 250 negative keyword limit on both account and ad group negatives. In my AdWords account I have over 1500 negative keywords and they've really helped reduce the number of unrealted/unwanted clicks. I want to use my same list in Yahoo but I don't know what to do about this limit.

1) Is there anyway around the limit? (Splitting the list between account and ad group would give me 500 but that's still only 33%)

2) Any idea why there's a limit in the first place?

Thanks in advance for the help!