Self hosted blogging offers a lot of earning opportunities but you will have to invest money to create the blog. Free hosted blog on the other hand does not cost any money, yet you still get a chance to earn. However, earning from free hosted blog can be really difficult because there are limited earning opportunities. For instance, except blogspot, you might not be able to use Adsense on any free hosted blogs. Another major problem is getting traffic, since most people do not trust free blog site, they avoid visiting free hosted blogs, therefore, getting traffic can be very difficult. When traffic is rare, income is also rare.