For larger companies I think that’s a fair assessment, but there’s a lot of small websites that I only use one or twice a year which are very useful, like camerasize.com, which otherwise I wouldn’t pay for.
>>thornc+(OP)
Sites like camerasize could feasibly target based on the niche they fill rather than showing generic "personalized" ads. There are ad networks out there that do this, e.g. Carbon.