Points.
$1 = 100 site points.
$50 = 5000 points.
$100 = 10,000 points.
Once you donate up to 5000 points, you are granted 1 title change. Each 5 points after will grant you with another title change. Likewise, a display name change costs 10k points, and another 5k after. With these changes you can add colors, bold and italics to your name/title. These changes don't cost any points so you still have 5000+ points to use on other things.
The most useful way to spend your points is on new days, which only cost 25 points.
New days grant you a.. NEW DAY! It gives you everything a regular system new day gives you (full turns, full pvp, etc..)
25 points is only 25 cents, it's just as much fun as playing at an arcade! :P
Other fun things to spend points on are dwellings. A flat costs 200, shack 500, but the most useful and expensive on is the castle, which costs 2000 points.
For the long run it's not a bad idea to invest in one, you will be able to store up to 75k gold, 250 gems and be able to send keys out to 20 players to chat privately in (as long as you don't do anything that will get you banned, you should be fine).
Something you can do if you are still weak, is buy mega magic weapon and armor which are level 20. They cost 50 points each, but it will come in handy for the first handful of VEs. They go away after you VE though as well as many other stat improvements. There are other little things that you can buy if necessary.
You can also name your mount (300 points, 50 after) to make it more personal and it will stay throughout VEs.
It is rumored that once you reach 1,000 points, Peeves stops taking your weapon. So he will reward you with turns and gems instead.
Lastly, by donating at least $50, your account will never be deleted! Accounts that reach 50 VEs will never be deleted either.
*I didn't even bother mentioning account referrals because people get too desperate for points and refer themselves to lose their main account. Only 50 points per person isn't worth the trouble.*