If you're Open Sourcing your product to get help, you will be deeply disappointed. Very few projects, even very large ones, ever see significant contribution from outside developers.
Our project is over 13 years old, used on millions of servers, and is about 95% written by one guy. There are some measurable benefits, like translations and more participatory users who help find bugs faster and occasionally even send patches. But, the odds of outside developers joining a non-developer-centric project, without some sort of incentive, are slim. So, developer tools tend to attract a lot of help. End user applications rarely do (look at GNOME for an example; it's the most important piece of desktop Linux, and yet 90% of the code is being written and maintained by people who are employed full-time to work on said code; volunteers make up a tiny portion of the project).
There are other good reasons to develop software under an Open Source model. But developers working for free is not one of them in the majority of cases, and you'll probably spend more time herding cats than actually getting work done, if that were your primary goal.
Our project is over 13 years old, used on millions of servers, and is about 95% written by one guy. There are some measurable benefits, like translations and more participatory users who help find bugs faster and occasionally even send patches. But, the odds of outside developers joining a non-developer-centric project, without some sort of incentive, are slim. So, developer tools tend to attract a lot of help. End user applications rarely do (look at GNOME for an example; it's the most important piece of desktop Linux, and yet 90% of the code is being written and maintained by people who are employed full-time to work on said code; volunteers make up a tiny portion of the project).
There are other good reasons to develop software under an Open Source model. But developers working for free is not one of them in the majority of cases, and you'll probably spend more time herding cats than actually getting work done, if that were your primary goal.