since airdrop is needed a minimun of 100 onions to participate?
The requirement came about halfway through when most already had coins in the wallet from the prior airdrops. It use to be that you couldn't sell any of your coins, now you can but you need to keep 100-coins in your wallet.
If you don't have 100 coins, then I'd consider buying in. DeepOnion's value is still below 30-million so it has tons of room to grow... and you can think of it as a dividend investment. You get to stake your coins
AND you get into the airdrop for additional value. So you'll earn some nice passive income while you wait for DeepOnion's value to go 10x.
In fact, there is no guarantee of growth of coins and money spent on the purchase may not return.
This is right and refers to every crypto currency. In the case of DeepOnion its coin price just has to be stable to have a good ROI.
As long as there is mass adoption and the coin give solutions to social problems, then there will be potential for cryptocurrencies like DeepOnion, and DeepOnion is proving to solve many social issues: social inequality, freedom, privacy, authenticity, etc.