[interblag]

According to these numbers the combined cost of replacing the battery and the screen is 22.99 + 44.99 == 67.98, which is less than half (~45.3%) of the cost of the original new phone. Comparing that to the market value of a used phone is a bit unfair, since screens and batteries drive the depreciation of used phones more than any other components (ignoring EoL timelines for OS security updates, etc), and in this example you're getting new ones. Plus not everyone needs a new screen and battery every year.

This definitely isn't going to be for everyone but, for what they're trying to do, IMO the numbers seem reasonable.