How can you be so sure about that?
Reality check! It's only profitable to mine if you have access to free electricity (most people don't), or you're a botnet operator (most people aren't) or invested and keep investing hundreds of thousands of $$$ into Bitcoin ASICs (most people don't, they invest thousands $$$ at best which is not enough to make mining profitable).
The more questionable part of the statement was the assertion that buyers don't care about PoW or PoS. They might not care about the inner workings, but they damn well care in so far as it affects the security (incl perceived security) and value (incl perceived value) of their investment. To some extent this may be arbitrary or unfair (or perhaps a better word is undeserved). Perhaps PoS just has a bad reputation for whatever reason not based in actual security (and being associated hundreds of PoS scam coins might well be part of the reason), which affects its perceived value and therefore is value. In that case it is still a bad investment (unless you want to make a bet on this changing in the future).
The thing is different PoS implementions are different. NXT's PoS implementation is not the same as Peercoin's PoS implementation, which in PoW world would be equivalent to hashrate of the network, hence security of different PoS coins is also different, same as security of Bitcoin's network is different from security of Dogecoin's network.
There has been no serious and full assessments of NXT PoS implementation by PoW experts yet. The most they did in regards to PoS was look at Peercoin's PoS and claim that any PoS is insecure, which is irrelevant and not true, because it doesn't say anything about NXT's particular implementation.
