I'm pretty new to adwords, done a bit of research, have a plan. My question is about using too many keywords in a campaign, or am i overthinking it. Imagine i have 220 keywords. This is hypothetical as i havent started the campaign. I have 20 really good keywords, they get good ctr. About 300 impressions and maybe 60 clicks per day, cost me 420.00 per day, 7 dollars per click. Say i also have 400 more keywords, they dont hardly get any impressions, lets say 90 impressions, 15 clicks total but the cost is next to nothing, lets call it 15 bucks, 1 dollar per click. Now, my question is this. Is there a negative impact for using these 400 keywords. Is there a negative impact on a campaign for having a bunch of keywords that don't get too many impressions??