I never said others thinking otherwise is wrong.
Well as an serious enthusiast (I believe you are as well) I like to produce photos that have maximum sharpness and noise-free (that pretty much means < ISO800 on my 5D3 for me), and because I don't shoot for money, I have the freedom to choose when and where I shoot to achieve that.
Otoh I can understand some paid pros who will have no choice but to continue to shoot in low light + high ISO situation such as dark venues/churches etc just because they have to 'get that shot'. Not in my situation thou.
That's just my personal experience, YMMV!
Fair enough, I just don't understand why you would limit yourself like that, especially if you're not selling your photos. I usually don't print my photos bigger than 8x10, but I do have a 20x30 on my wall that I took in Munich with a 20D at ISO1600 and literally everyone who's seen it loves it, including myself. Sometimes those higher ISO's are just necessary, and when they are the 6D and 5DIII are life savers.
An example at ISO12,800. This shot was used in a program for their next event
Pam, Silks-33 by EverydayGetaway, on Flickr
Is it a little grainy? Sure, but unless you're a photographer or are viewing it at HUGE sizes there is no way you'd really notice. The average person doesn't look at a photo and scrutinize over noise or sharpness, they care about the content of the photo (which is what photography is about).