Close, I've taken 50,000 images in a weekend. However some weekends I only shoot 1000 depending at the event, and some weekends I don't shoot at all. The key is that for those weekends that I shoot a ton I need 20 cards, so owning less than 20 cards is not doable (I actually own about 50 CF cards and 20 SD cards). Also, I load onto a laptop or server multiple times a day so the need the 20 cards is for organization not capacity. Usually I shoot for myself but when I shoot for others often the requirement is to show up with 20 cards for the same reason.Wow! That's an impressive burn rate. At 3,000 images per card, that's 60,000 images a weekend, or a shutter replacement every 8 months or so.
I've replaced my share of shutters and mirror boxes, however, on 1DXs I can usually get twice the rated clicks out of a shutter. Usually 800,000 clicks or more on a 1DX2. Mirror boxes usually go after 1.2 to 1.5 million clicks. I average 500,000 clicks/year but I have other shooters who use my gear, including my daughter who put another 1/2 million clicks on various bodies per year.