So glad you asked about the two-person mounts! There are actually two methods to get it for free:
1.) Invite your friends to play. The longer they sub, the more benefits you get. One of those benefits is a two-person mount. I don't have friends I can invite to play this game with me, does that make this option fair?
2.) Get the standard eternal bonding package. Boom. two-person mount. For free. The gold package (the one that actually costs money) probably has a prettier two-person mount than the standard package, but that's an aesthetic choice.
The fact of the matter is that it does not affect gameplay. It's okay because it does not allow players to spend thousands of dollars to get endgame raid-level gear, personal housing, every Nexus and Supra in the game, and all of the achievements. That is why it's allowed. Because this is a game first and foremost and if the integrity of gameplay is compromised by paying money to bypass hard work, then the game itself collapses. Paying for extra aesthetic pieces doesn't disrupt the status quo.
Seriously, what is your problem with the cash shop? Have you even seen the items on there right now? Other than Fantasias and Sleipnir, there is literally nothing good on there. It's all old holiday gear and a handful of minions. So f**king what?
There is a local chinese resturant I go to every so often called Oriental Jade. They have some very decent chinese food and they also have a gift shop for chinese nick-knacks. How much of an asshole would I appear to be if I had a meal, walked into the gift shop, grabbed a nick-knack from the gift shop, and then got appalled if they decided to charge me for it? "I ate here! How dare you charge me extra money for this!? That's unacceptable!"
The day that this game's cash shop introduces gameplay-enhancing items is the day I take your side on the issue. But that is not today and I don't see it ever happening. Because Yoshi-P knows that, if he did, over half of his playerbase would abandon ship. That's why he made a point during Fanfest to say "The cash shop will only have cosmetic items in it." That was a reassurance with the knowledge that it wouldn't happen.
Now if you want to be jaded and continue to whine about the cash shop, that's your prerogative. Just know that the cash shop isn't leaving, so if it bothers you that much, your two options are to either leave yourself or to grin and bear it, because I'm sorry. You are in a very vocal, very small minority of players that are still around and there are many more people here who are more than fine with a cosmetic-only cash shop.