With the current presscoverage of the 2nd echelon of the championship from WRC TV, radio and website many drivers are struggeling to find sponsors wanting to back them. The promotor need to give them more to sell. Often the competition in R5 is more even, and more exiting than in WRCars.

I think BRC is the best option if you think press per euro for 2018.
Eurosport have a good product in ERC, but they need to put more into it, so that become european champion means something. For people to afford themfull series, they need to cut the 3 island rallies. Too expensive. Focus on rallies in north/ central Europe, that will gather most cars and most fans.