These are the scams I've witnessed myself in the last six months and how much the scammers got away with. I know there are a lot more but these are the ones I saw first hand.

EthDark: a scammy shitcoin - At least 2 million usd
Litecoin gold- scam erc20 token- Around 200k usd
Ethereum cash- scam erc20 token - anywhere from 100k-1m hard to tell
Ethereum lite- scam erc20 token - at least 70k usd made in one weekend
Denaro ICO- straight up scam, devs left with at least 10million
Stone- Fake private dag crypto coin- Scammer got at least 300k usd
Confido- another scam ico, scammers made away with 500k usd.
Bitcoinred- another erc20 scam token.- AT least 1 million +
Mooncoin- 62 billion coins that were stolen from cryptsy were not locked, and dumped over 1 mill usd.
Wifi global- another scam ICO- at least 500k usd.