Hey Ayush, good questions!

1. Usually a logo is designed to be a system of parts that can be extended to other applications. For example, the curve of a C the visual margin on all collateral material. But I'd say sometimes the quality and complexity merit the spend. Often it does not.

2. See above

3. To my knowledge there is no true KPI to measure a new logo's performance beyond sentiment tracking. And even then, people often have an initial knee-jerk response to a new logo gradually grow to accept it over time.