Ah that makes more sense, I was getting awfully confused as my motherboard was £30 and it's working fine yet some people are paying £140 for them
Some overclock better, some give better performance in certain tasks, some are known for better build quality, some have longer warranties, some have more cooling, some have a more user friendly BIOS, some have a more capable BIOS, some look awesome. There's loads to consider, really.