I suspect you would need some special connections, in order to earn a reasonable and dependable side income by repairing broken electronics in this country.
The second hand market here is way too small and limited in scope to allow you to get broken stuff at a low price, and later sell the repaired equipment at a profit. Even shipping repaired items out of the country would heavily cut into the bottom line due to the exorbitant shipping costs.
Your poll seem to be missing an option: Professionals, who run their own home lab separate from their daytime job, whether self employed or otherwise.