I'm going to say it. Pyke buff only rewards skilled players with good teams
Pyke still needs to kill specifically with his R for all this chunk of gold, and he can't get that if his team sucks that much, or if he sucks that much. This buff was aimed specifically to reward skilled players and good teamplay between pyke and his mates. He can't get kills with his R if one of two sides can't get the enemy low enough to execute.
To really feel the pyke buff you need to be decent at him, and more than that, have a decent team that plays with you and not against you. At the end of the day, Pyke is still a support, and his viability is colinear to his team's viability. If they suck too hard, fat chance you're getting anywhere on your own.