Here is a cheat for full aspiration in The Sims 2. Type ctrl+shift+c and in the dialog box type maxmotives.
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setaspirationlevel ..... (dots mean numbers)
Yes, all you need to do it type in the boolprop cheat, then shiftclick on your Sims, then click "set aspiration..." there are 2. You can change their apiration all-together or you can make it lower or Platinum ect...
there is the money cheat (to open the box do ctrl+shift+c) then type in motherlode there is a cheat to make them happy you type in maxmotives if you want you Sims aspiration meter to go up you type in aspiration level 20
the wants on sims 2 are things that they want to do (kinda), when you full fill their wants you get aspiration points and if you click on the treasure chest there are things that you can sort of buy with those aspiration points- when a fear happens you loose points and aspiration goes down.
They are rewards for how high your aspiration meter is and so you can enjoy things out of it. Enjoy