expacs and game costs aren't pay to win models. You don't understand what a pay to win model is. You can't buy any in game content that isn't aesthetic in Destiny. In warframe I have already stated what you can buy, which you quite frankly weren't aware of. Warframe is free to play, so that they can add microtransactions, why they went with this model is they were an indie company not confident in that selling it at a cost wouldn't end up in failure their best bet was to go f2p with a p2w model. One of these meothos is to just straight up buy stuff, they then realized "Crap, a lot of players are just playing for free and not generating us revenue... Wait, I have an idea. How about we add exclusive and better gear unobtainable in the game and just sell it at a premium to try and get those free to players to buy it, hehehehehe that will work hehehehehe" And through this system they are able to generate enough revenue to give out free emotes and crap, as well with every update more stuff you can buy as well. Destiny costs a lot more to make than Warframe, and is more focuses on singular releases and xpacs rather than a constantly updated game adding constant microtransactions like Warframe is.