Bicycles that aren't in a rideable condition - worth fixing?

What I look at when considering whether a bicycle is worth fixing back to a rideable condition.

Table of CONTENTS:
00:00 Introduction
01:05 Inspecting the frame
01:43 Seatpost
03:19 Bottom bracket
05:11 Other stuff
07:50 The bottom line

Useful LINKS:

Anti-seize (mounting pastes) - preventing things from getting stuck in the frame:
https://bike.bikegremlin.com/7172/anti-seize/

Threaded bottom bracket standards:
https://bike.bikegremlin.com/1634/bicycle-bottom-bracket-standards-explained/

Inspecting a used (2nd hand) bicycle - video:
https://www.youtube.com/watch?v=m3UKLR7XLDI

Inspecting a used bicycle - article:
https://bike.bikegremlin.com/1102/looking-second-hand-bicycle/

Cup and cone hub overhaul:
https://bike.bikegremlin.com/1461/hub-overhaul/

List of all the BikeGremlin videos, sorted by categories:
https://www.bikegremlin.com/youtube/

id: 1059