Having more than one blog need you to update .Are you able to do it everyday?I have wrote this issue in my blog.
rather than managing 100 blogs , its better to bring 2-3 blogs to the top spot in G and then work on others .they may also be useful for back links .
I agree 100 blog is easier to make $100 a day from adsense, but you're willing to spend some money to start. What I did is pay some staff to help me promote and post for my blogs, there more than 100 anyway...
Unless you're using an auto poster to fill your blogs with complete drivel, 100 blogs is not going to be something you can maintain. It's always better to go for a low number of quality blogs in my opinion. Writing quality posts for 5 or 10 blogs much more likely to earn you your $100 without getting you banned in Adsense and Google. You're also more likely to be able to flip those blogs for thousands of dollars should you wish to do so.
Finally, I agree for earning adsense from more than one blogs, but not 100. Impossible to maintain them easily.. 3 or 5 niche blogs with reasonable traffic can make more money for us ..
It is not easy to maintain 100 blogs, but you can earn 100 per day from 10 blog, if you work hard on them. Good luck
OMG anyone saying multiple blogs - simply has NO idea : Do you know the resources that one auto blog takes away from your server ? just one blog with auto post will crash your server, updating hourly is heavy, pinging all these posts is exhausting, then there's managing the auto posts - they're not that cruise and forget - most are riddled with errors and if you get a server hang up (which you will) then you get multiple (mirrored posts/duplicate posts). So auto posting is exhausting and to host just 10 auto blogs you will need a very good and expensive server. I have one successful blog, once it hits 170+ visitors online at once - my dedicated server crashes - so imagine multiple blogs with reasonable success .... this is a silly idea that is mentioned multiple times per week.
I'd try 2 or 3 and maintain them. By doing this you can get into different niches and you may find out that some pay better then others and then focus on that one particular niche.
I think its always good to have as much as you can provided you are able to maintain that. One person can not handle more than 4 - 5 at a time. If you have a good team then you can handle 100 or even 200.
One blog all the way, for me, I just try and focus on all the different niches I'm into, it's easier just to have a general blog and categorize all the various niches you go on about.
Exactly .... you don't need one hundred blogs to cover 100 subjects, that's just stupid, imagine if Youtube said "errrr we need 100 sites to cover each video category". You don't even need a niche - niche is a over used term, I have a niche and that's being a blogger (kind of). Why not go with One Blog and 100 categories ? same thing really .... just easier to manage.
10 blogs might be better, and probably more realistic to maintain. 100 site with general 'timeless' content, might be ok too.
It is very difficult to maintain 100 blogs. Don't forget that you have to do your daily SEO on each one. I think that it would be better if you would just maintain a few sites then continue working on it's SEO.
There are many people making adsense money from sites that are stagnant for years .... so yeah, it's possible to set 100 or 1000 and get a dollar a blog