I don't get something, PoS and PoW rewards are 0 + tx, so basically just tx fees ? What's the incentive to make people pow mine or stake?
PoW miners gather tx fees from transactions as a reward because their work is more energy intensive, PoS miners destroy tx fees - create deflation and make the remaining coins more rare and valuable. People mine 42 to take part in this process and protect their investments.
also how much you need to stake ?
The input is mature and ready to generate the block when the CoinDay is ≥ 1. You can calculate it. For example, the input size 0.04 will be ready to generate the block in 1/0.04=25 days, 0.02 - in 1/0.02=50 days, 0.01 - in 1/0.01=100 days, etc. Minimum stake age is 42 hours, maximum age is not limited.
Also,
You can predict the exact time when each input will find the block with the "scaninput" command. Select from the wallet menu bar: Help - Debug window - Console - type "scaninput" - press "Enter" and follow the instructions. Example:
scaninput '{"txid":"00c3ecf50748b41b63a8e9931845474c9c1d6daace72bae34e1d71080b54be59", "days":30}'
[
{
"nout" : 2,
"hash" : "000005cbefc94bfc6851d95fea7f87ee58498ffc64e9973719cc1f19b433df23",
"time" : "2017-02-25 00:02:44 UTC"
},
{
"nout" : 2,
"hash" : "00000c7e8ecc4c94ed9933601ce559071571f3dc8dea8c74136eb74bbcd1e0d3",
"time" : "2017-03-17 11:47:12 UTC"
}
]
How to set up the desirable split threshold of inputs, see
here.