Although there is a possibility of someone giving their testimony of healing falsely, for attention or popularity, this just doesn't make much sense when looking at the many testimonies given on curezone by people that haven't posted again since.
However, I have seen people post testimonies of NO healing or cure. Sometimes, they will keep posting for attention like flamers or because they never really never found the true cause of their illness or they didn't follow the protocols correctly.
For the most part, people are typically honest and supply their testimonies for free in the hope of helpling others!!