If one actually manages to complete a worthy paper on such problems, and:
a) they do not have access to a math journal, or a math uni department they can sent the work to
b) they feel that in the case the work is good it may be stolen
then it makes a lot of sense to try to post it in some places on the web. Of course CivFanatics is not the best choice for that sort of thing (afaik there are by now dedicated math forums where some sections are about members posting this sort of work, supposedly with the view that they are protected in case of a breakthrough, etc).
Anyway, i wish good luck on anyone trying their mind with those sorts of math problems.