Many survival items require regular maintenance. From the generator which needs to be turned over and run a few hours every month and have the gas changed or burned through each year to the medicines and Potable Aqua tablets which will be ineffective past their date. Don't even think about trying to store water indefinately. I once thought that I had sealed up some oats only to find a thriving mouse village upon opening the top. (they had long since opened the bottom!) I wouldn't want to be thrust into a survival situation with tools with which I am unfamiliar. I carry, use, sharpen, clean and oil my leatherman daily. It may not be the strongest blade or the best pliers but I know what it can do and I know how to care for it and I know it is sharp. If any corrosion should develop (hasn't yet) I will see it immediately and it will be cleaned off and re-sharpened before a week is out. If I find myself in a survival situation and I still have my belt I will also have a very sharp leatherman in clean good working order. I may also have my bushman if I was lost while camping or hiking. My PSK does have some Xacto blades and Razor blades which are marginally useful. I think that I could skin a rodent with the curved Xacto blade and I am sure I can make a decent spear with the pointed Xacto blade. I wouldn't want to have to hack my arm off with either but they are stainless, stored with light oil coating in plastic baggie in sealed PSK tin so they should be fairly sharp when needed. (unless the iodine from the PA has come loose and caused bad corrosion.) I check them every 3 months when I am resupplying my PA and Med's.

If I expected my survival knowledge to stay sharp without going outside and practicing it I would probably discover that it corrodes faster than my leatherman. At least monthly take your survival tools outside (including your head) and use them. If they require servicing, updating, refreshing, sharpening, cleaning etc. Then take care of them. If you take care of your tools they will take care of you. Unfortunately, this isn't something like changing the oil in your car that you can pay someone else to do. If you don't know how to use and care for your survival gear there won't be anyone there to help you at any price.