Well, for me, I try to conserve while still wearing most of the time. I go through 1-2 (Depending on if I have a doubler than just one) Then again I also don't mess unless I know I'm going to have the privacy to do so, and I will pull my diaper down to use the toilet if necessary. However, just to see how much it would cost me, I got a potty training app on my phone for shits and giggles, and calculated that I'd use between 4-6 diapers a day if I changed every time I went, now, that's also including me holding it too, for example if I don't want to mess but am not close to a toilet so I wait to go, I'd probably be able to cut back a change out of that by just peeing when I messed but since I don't do that that often. Also I also try to make sure I'm well powdered and will apply rash cream if I think I might get a rash, as a result I rarely if ever get diaper rash and can stay in the same (wet only) diaper for upwards of 12+ hours depending on wetness level and number of boosters. I change when it gets uncomfortable or if I leak, that way I conserve, otherwise I'd be looking at probably around $100/week in diapers alone, or $400 a month, granted, that's ABU diapers. I'd much rather only pay that once every four-six months, Lol. Of course since my income is based solely on people giving me money, birthday money, and money from holidays, that rarely happens so I try to conserve as much as I can. So it really depends on the context of the question.
I just wish I had a big to my little that would enjoy changing me and spoiling me by buying me enough diapers to keep me diapered 24/7 and enforcing it too lol. That's the dream right? XD