I'm not sure I understand the part were you talk about staking = losing... how ?
If you don't stake you use it. Using a token/coin/currency give its value. As long as you don't spend/use it, it remain virtual.
Staking coins = gaining interest. Because this is a default no-cost options, everyone is doing it thus the "value" present on the network will be split across existing stake and new issued coins for the stakes (if the coin is not fully mined). Thus, you are not actually gaining "value" but you spread it across increasingly more coins, something called inflation of monetary mass.
Not staking coins means your value is diminished because the individual tokens are worth less. Or compared to stakers, you don't gain as much. Being a zero sum game without value influx/outflux, not staking coins puts you in a constant loss of value.
Why would you hold a coin that holds it's value like Bitcoin or one that loses value like Peercoin? Oh, you only want to use it when really needed? Why would anyone provide counterparty for your need if they can lose if your demand is lower than expected.
The main argument against PoS is the old "the rich get richer". Not a problem with that, except they do NOTHING but freeze coins, there is no risk involved inside the system. They don't buy hardware, they don't pay utilities, they don't hire people. They just do nothing and get rewarded. You think Bitcoin hodlers are gaining rude profits by doing nothing? PoS makes it even worse. But again, without actual new value added into the system, the existing value is spread around to the existing coins (think stable market cap) and each coin is losing value. There is a difference between theory and application, just like Communism, some things look great on paper but fail the test of reality.
As for providing extra services... what are the benefits of using NXT/MSC/XC?
There is no interest in Nxt. The interest that some PoS coin added is called minting (Mintcoin).
In Nxt, there is forging : it reward owners of nodes with the fees used for transactions and services use.
You don't do nothing, you must run a node to get rewarded. The reward is proportional to your stake like the reward from mining is proportional to your investment in hardware. The people that forge, get about 2-5% per year or something. In fact, none of the big Nxt holders forge. Probably because the gain is ridiculous.
Notice that there are no inflation in PoS like Nxt, the total max amount of coins remain the same and lost coins add value to others.
There is a difference between theory and application. In fact, the theoretical problems of Nxt doesn't apply : no one is getting rich doing nothing (gain from forging is too small for investors to forge for that purpose), the initial distribution is not a problem for users, the network is immune to 51% attack (as no pool exist), there is no Nxt fork (still alive).
As for providing extra services, Nxt is just so mind-blowing that others cryptos seems obsolete compared to it.
Here a some services that are already active or in development :
Alias System
Arbitrary Messages
Asset Exchange
Automated Transactions
Digital Goods Store
Instant Transactions
Judgement System
Monetary System
Multigateway++
Transparent Forging
Voting System
Parallel Blockchains
...
All of these features have a separate board on
nxtforum.org. The most impressive is the Asset Exchange. Everything is included in the native client.
