Most Free to Play game, you will want to spend a little money on the game, at least to get the subscription. Some of them you don't really ever have to spend any money at all on them if you don't want to, Example: Star Trek Online, Planetside 2. Then, there are those games that, you pretty much have to spend lots more money on them, than you ever would a Subscription, or Pay to Play Game. Skyforge is one of the latter. Which comes as no surprise, since it is the 'Allods Team'. Allods Online was the exact same way, actually it was a little worse than Skyforge.
Still yet Skyforge sells 'Argents', which you need to buy 'Victors Medals', so you can level up your main stat in the game 'Might'. There is currently no way to exchange the in-game currency into the cash shop currency (which the more successful Free to Play games have). They have recently added a Ranking System to the Subscription System, which requires you to pay to rank up your subscription. They pretty much give the Subscription away. However, if you don't know that (Which there is no way for you to know this until after you have played for a while), and you go buy say...a 6 month Subscription. Well, now you are in the position where you have to pay extra to Rank Up your Subscription that you just bought (This don't sound cool does it? Well...it's not.)
To be fair though, no you don't "Have" to spend money if you don't want to, as those that "Do" spend money would have you believe. Although, if you do not spend decent chunks of money on the game you will never catch the carrot so to speak. Moreover, even if you so spend a descent amount of money, your still going to be one step away from reaching that carrot. As, the progression system in this game is set up to keep you chasing the carrot, because they have not 'Finished Developing their Content'. The only ones that get to do the End Game content, are the 'Whales', (the guys that spend insane amounts of money on the game).
Futhermore, the player base is extremely small, and there is a steady stream of folks walking out the door each day. So, what you have is "Big Fish, Small Pond".
I would strongly suggest that you stay away from this game. The game was fun at one time, and it did have a currency exchange at one time. It was actually playable at one time. But, as a new player trying to come into it. Trust me, there are better games out there that will provide you a lot more fun, and entertainment. Just trying to help folks out.