drakandar explained it very well:

 People are like "hey, let's buy in large now and when the value goes 'to the moon', I can just sit on my butt and get money for free'.


I had worded it different but that is what people hope when investing in POS coins or in any Coin with a reward structor based on the amount of the coins they hold.

Also the Tomato example is amusing and on the point. POS doesn't generate value to a coin and that is why it doesn't make sense in investing into pure POS Coins. The Value has to come from somewhere else. I have none of the POS coins that drakandar listed.

FairCoins value is the FairCoin Market and Economie. I can't think of anything better that gives a Coin a real value than that you will need it to buy specific products you can't buy with any other currency.

Now you can figure that Coin that has something giveing it true value and offering POS is a dream for Crypto-Investors. (A note here such an  investment is always to be considered as a very high risk investment)

Eleminating POS does in no way reduce the real Coin Value .. in the oposite it will increase it over time due to Coins getting lost... but it reduces the attractivness for those "Buy and wait for the moon"-Coin hunters. It's very clear that the most interested in crypto coins are investing into a coin in the hope to get the lucky one that makes them rich somewhen.