why do you waste your time with free hosted blogs... many people don't trade links with free hosted sites.

i like $1000 a month

Now I make blogs on subdomains on my own domain, I had no idea that something like wordpress multisite exists, if I knew I would not build so many blogs on free host.

If you want to get good link trades then use one domain per site.

adsense doesn't accept adult websites....

I wouldn't be so obsessed with the pr of trading partners. You're just starting out and you are mostly on free hosted blogs right now. I suggest going for quality in other ways such as relevancy and placement.

While putting blogs on your own subdomains is better than using freehosts, you will get far more people wanting to trade with you if you make your blogs on their own domains.

You can use BlogsOrganizer to manage your blogs across multiple domains/hosts.

Of course, all this means you will have to spend more money, but it's worth it.

Good luck.

I get approved all the time.. so you are probably wrong.

As has been said, write quality, original content for every post.

NEVER use the copy supplied, hundreds (if not thousands) of others have done exactly the same.

Check what makes a sponsor interesting. If they focus on a fetish/niche they might not even know it.

Consider who is searching for that niche and write for the largest audience.

Check Google Keyword tools and find the first low competition/high search vol term related to that niche and stick with it for every relevant post.

Check these keywords regularly and write accordingly, altering your target once every three months.