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boots... I guess it depends how much you ski. I wore a pair a bit too long, and they actually sheered mid turn at the ankle. Top separated from the bottom. Been skiing a long time so wasn't a problem but yeah do keep checking them and don't assume they will last forever!
My rule of thumb is new boots roughly every 90->120 days of skiing new boot time. For me that's normally every 3 years (but not recently due to covid)
The last skis I hired were ~£2k in the shop (admittedly peak season mountain prices).
For one or two weeks a year buying your own skis makes no sense at all once you factor in servicing, excess baggage fees, etc. It's different if you do a season, but even then the hire shops have great deals for season long rentals (and you can often swap them around).
Boots make complete sense though. My second ever pair will probably see me through to the end of my skiing days.