I think your maths are wrong!
If Nem is worth $ 0.28 with 1 Bitcoin at $7340
it means: 1 xem = 0.000038BTC
that is much less than the current value.
I believe that if 1 BTC = $ 7340 then 1 xem should be worth in 2018 at least 0.0001BTC or about $ 0.7