How much money do you need to farm airdrops?

I'm curious about something related to cryptocurrency farming. Could you please enlighten me on the topic of airdrops? Specifically, how much money do you actually need to engage in airdrop farming? Is there a minimum threshold or does it vary depending on the type of project? Also, do you think the initial investment is worth it considering the potential rewards from airdrops? I'm trying to weigh the risks and rewards of this endeavor, so your insights would be greatly appreciated.