Users earn coins while they use Similar Worlds and stay good members. Good members get coins faster, while members that don't follow good practices will get penalties on the coin earnings.
We don't allow members to give coins to other members, as we want our members to value their profiles. This means that they have to be good members to be able to earn coins.
If we allowed users to give coins to others, some users would use that when creating multiple profiles, by just passing coins from the older profile to the new profile, without having to "work" to earn coins on the new profile. Not only that, if there are once-off features where we reward people with a lumpsum, users could create several profiles just to get that lumpsum, and then pass it to their main profile.