Unfortunately typing scams on the internet seem to outnumber genuine typing jobs by a considerable amount. Not only are there scam sites but also site claiming to educate people about the scams only to redirect them to the scams they claim they are helping you avoid.
It seems like it is almost impossible to tell the genuine typing from home jobs from the typing from home scams. The confusion comes from where sites mislead people into thinking that they are getting a job when in fact they are just paying a membership fee to get access to a list of jobs or just paying for a list of potential employers. This is the equivalent to you buying your local paper to look for jobs, the act of buying the paper is not going to get you a job. It is only when you apply for the job directly with the company that you have any chance of actually getting work.
If you are looking to be employed by someone else in a home typing position then you should never have to pay out any money, it's as simple as that. If you want typing work and you pay out money you are going to get scammed.
If however you are looking for help, training or opportunities to help you work for yourself doing typing then you very well may pay for this service or information. However please be ware of what you are paying for, make sure that you understand what you are going to get for your money. If after reading the site or the offer and you do not fully understand it then either contact them to get clarification or leave well alone.
There is a lot of free information available on the internet that can help you in your search to find home typing work. You should never trust what any one site tells you, instead search for more information and cross reference your results.