Question about this...

I am a Nexus card holder and recently applied and was approved for Global Entry (online at GOES, took all of 30 minutes to get approved, no further paperwork or interview required). This morning I looked into the Privium/FLUX thing and it appears that in order for me to get a Privium card that I'd have to pay literally hundreds of Euros to sign up and a couple of hundred Euros per year to maintain my membership. If Germany is the next country to join FLUX, am I to assume that I'd have to pay hundreds of Euros for their program as well? Seems like a cost model that could quickly require many hundreds of Euros per year to have FLUX access to all of the EU countries that I visit regularly.