Whilst I don't disagree, I think it's valid to highlight and mentally flag oddities like this.
By all means carry on about your business and part with your hard-earned if you feel so inclined, but there is nothing wrong with analysing the market and people being able to make their own informed decisions.
Its odd because we don't know the seller, we assume fraudulent activities., this is not new. People buying asset and then dumping it for whatever reasons. All we are doing here is assumption.
The only fact here is, someone bought loads of domain and now selling it few months later at a loss. This is the only fact, the rest is speculation/assumption. So, no, you are not making an informed decisions at all, you only have one fact and that's it, nothing else and this fact does not indicate anything other than that.
I have read people saying money laundry or something to do with paying less tax or something sinister.
Another example is the guy that setup .xyz, he bought loads of LL during the Nominet auctions and from few people, he came and dump them on Domainlore, some at 70% loss, while he was raising money to setup .xyz. In this situation, we know the reasons. While we don't know the reason why this seller is dumping the domain names he bought does not give us any right to be suggesting any fraudulent activities.
People dump assets for many reasons, whoever bought them gets a bargain and they move on.
I'm out on this thread anyway, good luck to you all and I hope none of you will ever find yourselves in a situation where assets of any kind does not matter to you anymore.