To elaborate further, cosmetics will definitely be a thing, ie. cool gear/skins which doesn't affect gameplay. Also a lot of that stuff is earner by exclusively playing the game, especially best items. I've also imagined that the coolest items would be for example a special badge for veterans of certain battle or war, or a commemorative sniper rifle with a personal inscription and a serial number. It's definitely cool to have a sniper rifle which says "For your sacrifices in the great Outpost War from the ever grateful Empire".
Some cosmetics may also be decals and paint buckets for ships/stations. Paint, once added, will most likely work in a way that it covers a certain area but has infinite uses, ie. you can re-use the paint if removed from the previous painted thing.
Microtransactions are option for selling some of the cosmetics, but definitely not all of it. I'd say there's four main tiers of cosmetics: regular stuff found in every hardware store for ingame credits, rare stuff found only outskirts of the universe for ingame credits, rare stuff handed out by factions/other players, and finally stuff which can be bought with real money.
We haven't made any decisions when or if the real money cosmetics are coming, but even if they do, they would be fair, ie. one-time purchases. I'd imagine one real money purchase which would hold value in the universe is a developer support item, and those can change bi-monthly or so, so they would have certain rarity as they are available only for a limited time. Such items could also have serial numbering to further increase the rarity.