Your system is your income and should therefore be a secret otherwise you will not gain the full value of your work. So why do so many people want to talk about their systems?
How many fools do you see on websites discussing a great system they have just discovered? Too many! If a system is worth anything then you keep it to yourself and maximise your profit.
Even the professionals are sometimes guilty of it. Nick Mordin, author of Mordin on Time, used to broadcast little anomalies he had discovered in horse race betting. Blabbed in a newspaper or in one of his books, the systems no longer work. Nick knows that he could have been a much wealthier person had he kept his mouth shut or left his pen in his pocket.
More often that not, people in forums discussing systems are beginners who have seen something that is too good to be true and want to validate their lack of knowledge on a forum. Those systems usually are too good to be true and are strewn with loss making errors. Assuming your knowledge improves then the last thing you want to do is discuss your work with others.
I guess that for some males of the species, bragging about a success when their life has been one of anything but success is a way of feeling better about themselves. It is a truth that many successful gamblers are abject failures in all other aspects of life and so the need to tell everyone that you have succeeded at something is great. That desire should always be repressed.
The only time you would want to broadcast a system is when it is a bad system. That is why the web is full of charlatans trying to sell you systems. Amazon is full of betting system books that are not worth the paper they are printed on. The only way you can make any money from a bad system is to sell it to someone gullible.
If you do have a winning system that has been properly back tested and tested again on future events but you don't have the money to invest in it yourself then, and only then, would you want to discuss it with potential backers. But do not tell them your trading rules, you must only tell them of the potential returns. In effect you are no different to acting as a money manager for a hedge fund.
There are a few investors on LinkedIn who will invest in your system or take you on as a proprietary sports trader but be wary of being ripped off. You will need to do your own research into who you are dealing with. I have changed my LinkedIn entry to stop the weekly emails from people wanting to invest in me but I do recommend the site for advertising your skills.
In conclusion. Sports betting is an arms race. You need good tools and good strategies to make a profit. And as in the millitary, you need to protect your assets with the utmost secrecy.