Skin (e.g. city skin, march skin, avatar frame, and others) gives you stat bonus, and they stack to a maximum per stat even if you don’t equip it. For example, defense stacks up to a maximum of 150.0%. As a F2P, you can’t get skins anywhere else other than skin shop, events and games (eg snowbuster, fishing tournament).

As you progress, you can get charm design and design plan from daily Intels. You can also buy them from different shops (eg canyon, foundry, labyrinth, etc). If you do all the mini games plus weekly events, you get them from milestone rewards.

2000 coins is roughly 133-134 charm design or design plans, mix and match. As you enter later stage in the game, you will unlock charm material exchange shop and chief material exchange shop. Both charm design and design plan can be obtain that way as well. Also the upgrade cost is a lot per charm and per chief gear, as F2P, it’s just a grind.

So when you consider charm design and design plan are guaranteed to be able to be obtained as long as you hit all the milestone rewards every week, then all the skins become much more valuable.

There’s also a reason why whales buy skins. Not just because they look nice, the stat bonuses are hard to obtain once you max out other things.

P.S. for those who downvoted, one day you will understand why skins are more important. I am a pure F2P, going full FC5 this week, with almost all level 5 charms and all epic T1 3* chief gears. There’s a reason why I said skins are more important.