Basically people know its hard building backlinks especially relevant ones. Basically a service that pays a person active on a particular amount of $ to put a particular url in there sig and leave it there for a week and post a specified amount. I pay you $x a week to put in your forum sig and make at leas...there sig on... Do you think it will work?
It will probably work, but you will need to figure out a pricing method becuase some forum posters make way more posts per day than others, so its difficult to go by a week time span rather than number of posts. The thing about forums posts is that the backlinks are all from the same domain, typically people looking for backlinks are looking for links from different domains.
Spread out the postings. Have it consistent over the month and overtime you'll get quite a good consistent visitors. Try to scout the price at getafreelancer.com or some elance.com and see how they charge. Im sure there is someone posting there asking for people to help them advertise on forums.
Definately a good idea. I think many people would be interested in this type of service. How much you can make from it though is difficult as people would want cheap links and posters would want maximum returns. But yeah there is definately a market for this type of thing. Good Luck
It doesn't work because your client will not hire a middle person to buy link Why does your client want to pay you for the commission,they can buy the other people sig without your help