All in all I run about 20 masternodes for ~15 various altcoins.Bought/mined them all at the very start when returns were max (and ROI min.), months later they still give about 75-200% per annum.
Can you give us some information about which coins are they?
There are several that I'm interested too, I'm currently thinking of getting into with Bubbletone UMT token which right now is having an ICO that will end this April. They only require minimum of 1000 UMT to operate but then I could have to consider the earnings before jumping into it.
VIVO, INN, SMART, ZEN, BWK, FOLM, ALQO, MUN, DESIRE, PURE, FOLM, IFX and few others. So far only MUN has really let me down.