Because [img][/img] suck, and are for lazy people. Such codes are based around the use of boards that are not designed to allow HTML (to prevent people screwing around with it) and requires additional coding to interpret such codes. The Combine crew is far smarter than the average board user, and are more than capable of specifying which HTML is and isn't allowed, and the handy guide to the right there should be plain enough for even a simpleton to use.
Or maybe that's just based on the fact that I taught myself HTML based on the code of existing pages about a decade ago...
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.