About MASTERNODE ROI
Block reward is 125 score
Block time 1 min.
50% masternode reward
Per day 60*24h = 1440 blocks per day
1440 / 2 * 125 = 90 000 score per day for all masternodes.

That means 180k score for all and now we should find how mush total MN can be and make calculations of how it  will be profitable.
Total supply 28,217,875 score and MN price - 25k
Total MN can be: 28 200 000 / 25 000  = 1128 total count.

No we divide earnings per day for MN on deployed MN.
If locked in MN :
10% (112)  -  803 score per day
20% (225)  -  400 score
30% (338)  -  266 score
40% (451)  -  199 score
50% (564)  -  159 score
60% (676)  -  133 score

In USD :
After MN release price will be at least 4k but lets check in diff prices and btc price 4500$. Price per day
If locked in MN :                    1k sat (0.045$) 2k (0.09$) 3k (0.13$) 4k (0.18$)
10% (112)  -  803 score             36.13$             72.27$      104$         144.5$
20% (225)  -  400 score             18$                  36$           52$           72$
30% (338)  -  266 score             11.97$             24$           35$           47.8$
40% (451)  -  199 score             8.95$               18$           26$           35.8$
50% (564)  -  159 score             7.15$               14.3$        20.6$        28.6$
60% (676)  -  133 score             5.98$               12$           17.3$        24$

And price will go to 15k sat if we compare it to crown price and supply
(15 000 000 crw and price about 33 k sat vs 28 000 000 score price should be about 15k sat)
With bittrex can be more..

Tell me if I'm wrong