The way I see it, it's better to have it and not need it, than need it but don't have it. As mentioned, I do shoot indoor sporting events sometimes, and not all locales are well lit (most are not in my cases). To get an acceptable shutter speed, ISO 3200 could be the only way to go. Unless you're not going to expand your photography experiences, otherwise, you never know, one day you may find them useful.