greedy pig 20$ are possible but not very realistic, before that 10.000 people will buy coins at 100$ ^^
OP is talking about LTC, not BTC price. It's quite obvious $20 in BTC world is unreal.
I wouldn't say $20 in the BTC world is unreal, though it's clear OP is talking about LTC. BTC could go down to $20, but it would take something catastrophic; something that Bitcoin may not be able to recover from. In other words, if Bitcoin goes down to $20, buying may then actually be a mistake.