That is a good question because we all experience PSA's and CSA's that either never worked, or worked for a while and then quit.
The answer is a simple yes, because YOU don't quit working. Success lies in what YOU do! Many have quit in the past and many will quit in the future. If you have the drive to continue you will be successful.
One good seed will produce fruit. Do what is in your control and plant as many "seeds" as possible.