i believe a good short term solution would be to use a automated process that filters out certain criteria from being posted such as links in the subject or posts that are just links. of course this will only work for a short time before the bots adapt. i have personally mentioned the issues about spam to a staff member and they said they were working on it. i dont doubt they are working on it but eliminating something like spambots and a next to impossible task.
i dont know the education background of the people here but mine is in computer science / networking and business. if you know about how bots and viruses and such work and you realize how the general populus operates a computer you will realize how difficult the problem is. all sides of the issue need to looked at, which customers are effected, how are they effected, whats the cost to fix the issue. then run the equations to see if its worth doing the fix, if there even is a fix.