Hope the £18 doesn't set a trend?! Although the likes of Wolves are already at that level. Not sure of all others?
2016 prices for PL sides ranged from £15 to £17.50 so not much of a differential between EL and PL.
You can understand why PL clubs were so adamantly against the proposed EL price reductions a few years ago when the EDRs were first introduced, weakening the top level with no risk to the 2nd tier!!