I myself am a moderator on an already established and large forum where the spamming is nearly non-existant compared to this site. However we do still get a fair amount and simply delete such post's, if all they add for example is lol, lmao etc..... Serial offenders are given warnings, have their posting abilities removed, suspensions and if after around 7-10 suspensions they haven`t learned their lesson they are banned. Leo-j for example would be long gone, as not only does he spam but would break just about every other rule we have. I hav.e been a long-time viewer and only recent member of this site and have been shocked by his behaviour and attitude, although I feel its simple immaturity.
I would say that members of this site have it relatively easy if they only get banned for a day or two for spamming and other rule breaches. I see no problem with putting a stop to one-word posting. A site admin and the mods have the right to enforce the rules as they see fit.