Holy shit, you put a ton of effort into your post. I'll upvote it for your dedication alone.
I think most masternode coins are scammy, nonetheless interesting info you provided.
Personally I prefere holding coins that have small returns like DCR or KMD but also offer fantastic possibilites in the future.
Also, I hate the referral idea, because a ton of referral-programs are scammy and only lose money for the refered person (especially cloud mining, not naming any companies, cough, but see my posts for detailed info why to avoid it).