> A new roof every 30 years at $10k is already noticeable

That'd be $333/year averaged out, two orders of magnitude away from 30K/year example of OP.

The $10K roof is noticeable precisely because it's an outlier that pulls the average up towards the 1-2% per year range for all but the least expensive houses.

If houses really consumed 5-10% of the purchase price on average per year, people wouldn't worry or talk so much about roof replacements; they'd be just other drops in the bucket.

I could replace my roof, literally the most expensive regular maintenance, for $10k a pop twice a year and still come out way under your estimate lol