how can you say you can set the camber yourself in a matter of minutes? i installed springs and caster/camber plates myself also and there was absolutely NO WAY i could set it myself. i didnt have any alignment tool(s) needed. you can't just look at it and say "oh that looks good". i put everything on and let the car sit for a couple days so the springs would settle and then got it aligned. i just threw the c/c plates on and tried to eyeball them to the stock location and let the shop do the rest. you're nuts if you think you can align a car by eyeballing it.
all in all you need the plates. if you dont you will probably end up butchering your strut tower holes with a drill to set the caster/camber correct if you use your stock plates. that's just not worth it in my opinion.