PoS innovation with Masternodes
You shouldn't use PoS to refer to Proof of Service as that abbreviation usually means Proof of Stake. Using "PoS" is misleading and provokes misunderstanding of DRKs features.
I suggest using "PoSVC" or just not abbreviate it at all.
Well, it is kind of both at the same time, so how about PoS&SVC ?

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What's commonly referred to as "Proof of Stake" is used for generating blocks. The "Proof of Service" mechanism doesn't do that. Also you aren't being paid for "staking" but for providing a service, i.e. running a masternode. That you need to prove possession of 1000 DRK (which in fact is a proof of stake technically) is imho not directly related to being paid but to being able to run the service in the first place.