I saw people pay 0.0023 BTC

While my account showing

You can pay a one-time fee in order to increase the capabilities of your account. Be warned that:

You can still be banned if you break the rules. You will not get any special treatment.
These memberships are not guaranteed to last forever, or to offer the same benefits forever.
No refunds will be given.
Available paid memberships:

Copper - 0.00675676 BTC: Allows you to post images even if you are a newbie, reduces the time-between-actions limit, and provides some of the same benefits as being of natural Member rank.
Pay to the Bitcoin address 3GBG2QdaqEGsNgJvjSQsmWCuZ2fWKQupnR. Once your transaction has 1 confirmation, revisit this page and then use the form which will appear in order to wear your new membership.