PoS rewards will depend on the transaction fees that will occur on the network and the amount of "active" PoS clients. So there is no way to tell you how many EXO you might get for letting the software just run. However it will depend on the balance/up time of your and all other nodes and is calculated/distributed on a monthly base.
There are restrictions for participating in 2nd stage. Those are more restrictive than 1st stage investments.
See
2nd stage investment rulesQuote from there:
2nd stage only 0.02 to 1.5 BTC will be considered. No LTC/NXT/... will be accepted for the 2nd stage. 2nd stage investments will start on 2nd April.
Before initiating any investment (escrowed or directly) PM eXo_coin on bitcointalk with the desired amount. He will accept/deny the investment then.
There will be an upper cap of total investments for the 2nd stage of 230 BTC. 2nd stage will be opened for about 2 weeks or 230BTC whatever happens first.
To invest as 2nd stage investor you must have an account on bitcointalk. We will only accept PMs that goes to eXo_coin (do not write in thread or mail).
If the investment is allowed (you got a positive answer from eXo_coin) then please initiate the transfer, PM eXo_coin again with the TXID, amount, a signed message of "i,yourexactbitcointalkname,am_the_owner_of_youramounthere_btc_as_2nd_stage_exocoin" (so include the calucalted sign, the exact message that you have signed and the address that you used for the signing process).
Be sure to sign with an address that is also part of one of the transaction's sender addresses. If you do not provide those information or include wrong information we may keep 0.005 up to 0.02 BTC as service charge for our team for the extra work. The same applies to investments that have not been accepted by us.
Thus we can prevent someone sending 10x 1.5 BTC to gain any majority - since we will check the profile of the one who PMs me with the TXID. If you would like to increase your initial investment (e.g. spend 0.1 BTC as early bird and then 0.1 BTC as 2nd stager ) - feel free to do so. Just do not exceed 1.5 BTC 50 LTC in total.