More fun to allow you to get in then larger traders come in and push market to trigger your stops if too tight, then reverse so take those who want to take 2nd bite at signal jump on and push market even further. I have developed couple signals based on retail's failures, but some of the original entries are profitable, let's retail "think" they are trading. And yes, some methods get too many subscribers and makes it impossible to get choice entries. I think almost anyone been in trading fair amount of years can reverse engineer almost anything, it is more of a game of doing since trading gets boring of waiting.
Another vendor might take service and he gives his clients your signals as well.
But the worst of is dealing with the public, most are cry babies, if you thinking of doing a service, better to do the Earn2trade thing, then you don't have to share your knowledge and hope it don't gets stolen.