Ah, paymium. By principle a mutation far worse than F2P, because at least the latter doesn't necessarily mean you get swindled.
I can see it now.
*pays good money for the game*
"Ah, brilliant! I loved the previous game and I cannot wait to cruise around in this one and cause unmitigated havoc for Chaos just to unwind from a shitty day at work before I tackle the story missions for rea- ooh, hold on. What's this about getting new vehicles?"
*game suggests you rent virtual vehicles using diamonds*
"...Oh, okay, I guess that's just the currency of this game's fictional countr-"
*the horrific realisation is reached that diamonds are a second currency, the more valuable one in the game that requires real life people*
"You're fucking joking. I've already paid good money for this, you cunts. Not content with what I already gave you, you're trying to psychologically batter me into giving you more spare change now? Fuck you.
"Never mind, I'll just hijack a vehicle and casually drive around the whole place and see how big the world is this time round."
*hits a bizarre invisible wall just before a long bridge leading to a large, hazy landmass on the other end. The game announces to you that the area is currently unavailable, but will be available to buy and download shortly*