Well, I don't need to lie and I'll be honest, I'm not getting the games for myself but to resell. In fact it's against their ToS to sell their games, and there's also a few reports of people getting their accounts blocked for trading too many gift links, still it only happens when trading gift links, trading keys is 100% safe (you can confirm this making a search on google).
If you are not interested in selling some keys at all, I understand. In case you want to give it a try, tell me and we can discuss.