Sincerely I didn't know much about steemit mate,but honestly when it come to hive have not really see this happening that much though I do see some users with small vote power up voting themselves too at times.
But it is not a rampant attitude here on hive since have joined,But i will still say that should not take away the fairness of engagement in the community, cause if everyone of us can up vote ourselves and get reward then it means engagement has lot it value