Originally Posted by
squeeze
You could, but the problem is that crafting in this game is not independent from the power of your character since they share a common upgrade system, i.e. Skill Points. So, every time you spend points in professions, you have weakened your character in a relative sense. It does not matter at first, but it starts to add up. By level 50, a maxed profession character would start severely gimped in power.
The alternative, of course, is to start crafting from level 50 or some max level of power progression, but there are many benefits to crafting for your character while levelling and account overall. So, it may not be good to wait that long either.
Hence why some players choose to have crafting alts. Make a few alts that fulfill all your crafting needs early and have your main remain competitive all the time and max out power progression skills as soon as possible.