Do you really need an ISO of 25600?

I’m looking to get into using DSLRs for photography, and one of my focuses is going to be low-light pictures. Some people say that the highest ISO you should ever use is 6400, but the cameras I ve been looking at all have ISOs higher than that, like 25,600, or 52,000. Do you really need that to take a high quality... show more I’m looking to get into using DSLRs for photography, and one of my focuses is going to be low-light pictures. Some people say that the highest ISO you should ever use is 6400, but the cameras I ve been looking at all have ISOs higher than that, like 25,600, or 52,000. Do you really need that to take a high quality low light picture though?
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