Kinda get what you mean but what would this be? a tourney held so often by STS? In no way would this be left to members to use at their will. Mainly because there are too many factors that can not be controlled for someone/people to take advantage of.

And if you chose the right person u get 2x, 3x etc. Of your money.
This for starters would not work if this could be made by anyone at anytime, it would just fail (Laundering)

Its a good idea, but this particular process wouldn't work unless this was a monthly/weekly event (which I doubt devs dont have time for)