Correct me if I am wrong but I am going to assume a few things:
- A service offers 1000 users for $X
- The service pays users $Y to join site with the potential to win an iPad/other offer as well as $Y.
If that is the case, the value of users is negative to the startup.
Here's why:
- Users are incentivised to join site, to win iPad thats it.
- They are won't pay to join a service (if its a paid service)
They are not incentivised to join and actually use the product, which are incentivised by acquiring them via Word of Mouth, SEO and other forms of advertising channels. Thus the LTV of the customer is $0 - they won't use the site, they'll just signup as it becomes more profitable for them to join 100 sites and do nothing than it is to join 1 and do something.
Similarly, the service itself is incentivised to actually cheat the startup as they will then get $X and a free iPad or something. They could easily do this by using a bot to join the services.
Even if the service won't do that, there will be users on the service who are actually prepared to do that as well using multiple payment emails etc - if they are paid for joining too!
Essentially by paying for this service, the startup has wasted money by paying for 1000 users who are going to do nothing on their service and have given a free iPad (or other prize).