You receive a return no matter what. If the node operators send something more on top of that, that can happen, but just like I don't vote witnesses on Hive for that reason I won't delegate on SPK Network for that reason.
But if you power up & delegate to an SPK Network node operator (so can't be anyone), both you and (s)he receive 0.015% APR. Won't be high, but won't be nothing either. If you just power up (without delegating), you receive 0.01% APR.
PS: Still in testnet, so wait for Monday/Tuesday to powerup and delegate.