Suggestions for Gifts, Invite and Scammers abuse

Invites:

• Only people with X amount of months of registration can send invites
  or
• Only people with successful X amount of Giveaways can send invites

Gifts:

• Get rid of point system
  and
• Limit the number of giveaways people can enter each day to 3~5 (which is pretty good, and also raises the chances of other people that actually want a game and not just to win something), number doesn't stack to the next day in case people don't try their luck on a gift.

Scammers:

People can fake user picture and account title. They can't however, fake account ID. Because it is already in use.

Example:

My account ID is iESCUDO

So this is the link: http://steamcommunity.com/id/iESCUDO/

Let's suppose i win something, account ID is iESCUDO, nick is ESCUDO.

ESCUDO wins.

Scammer fakes account name to ESCUDO and copies account image.

Scammer can't fake ID

Gifter is contacted by scammer, Gifter goes to giveaway page and clicks the winner's link. In winner's profile clicks on "Click here" which is in front of "Steam Profile", checks winner's ID, compares with scammer's profile ID. Scammer is caught.

Even if the ID is numbers, they won't change because it's the account "number".