Unrelated to the Gomes incident, but I don't think it's a conspiracy theory to say the bigger teams get more of the decisions.
In part, it's because they're more likely on balance to be looking for such decisions, the better teams will likely be dominating the ball and/or creating chances and getting players into the box where the big decisions are made. Just in recent weeks you've the difference it makes with Chelsea given a blatantly offside goal vs Cardiff which saw that game turn on it's head. How big would those 3 pts have been to Cardiff?
Add that to the amount of pundits who rail against decisions that go against the bigger teams (clearly there is a unquestionable bias here in terms of media representation) and there is enough pressure there to effect some refereeing decisions that can make a difference over the course of a season. Doesn't even have to be much, even one or two big calls can as we see right now be the difference between top 4 or being outside of the top 4, or perhaps even winning the league.
I don't know whether it'll change much, but it's one of the reasons I was in favour of VAR coming in. I think it could be one of the biggest levellers in the PL. We already saw how bigger teams in the World Cup like Germany did lose out to VAR decisions and I hope it means there is more of a consistency across refereeing decisions in the PL over time now.