Most of MyInkedSpace is free. You can send private messages, IM, chat, poke, leave comments, etc all for free.
MyInkedSpace costs money every month to stay up. There's server expenses, bandwidth, etc that have to be paid. In order to help ensure that MyInkedSpace can stay up for everyone to use some features can be paid for with the site currency, Points. Points can be earned or bought.
For every person you refer you receive 1-day of VIP! Note: Creating fake accounts will get your account perm banned.
Buying is the fastest way and helps the most since the site expenses are paid with real world money, not the site currency.