First Of all, let’s us list what are the disadvantages adn try to solve it:

• One of the most difficult problem is the Google Page Rank Drop, but you can avoid it by trying to write 2-3 unpaid posts for each paid review you write in your blog, but this will not make sure that google will not flag you, So I really recommend to write a realted piad reviews. This will help you alot to avoid the page rank drop.
• Also, Try not to write about Gambling sites, like Pocker sites, and online casinos sites, because google will flag your blog as soon as there is a casino review in your blog.
• Try to focus on one get paid to blog program, don’t use all companies on one blog.

There are many of Pay Per Post Companies around, some are really good like PPP, Smorty , SponsoredReviews, Let me recommend here a new Get paid to blog company called BloggersReview, they are new but i think they are the next big thing in the blogging sphere, check them to know more about thier system.

It is easy to make money with your blog, but you have to keep it up by doing the following:

1. Write Original contents.
2. Be positive
3. Try to link your blog Pages with each other.
4. Focus on how to increase your traffic and your backlinks.

I would be glad to answer all of your questions, so don’t hesitate to contact me.

Good Luck