4 speed conversion. Help or hurt value of car?

I am on the other side of the spectrum ....I would say it would help.

I have changed every automatic car I have to manual shift and when I buy cars the first thing I look for is a third pedal.

if I were to spend big hard earned money on a car it would have to be a 4 speed or I would walk away.

keep in mind that 4 speed conversions are expensive, there is nothing cheap about anything 4 speed.