For all those looking to have a very nice and very clean cheat for this game, I found a trainer for it. It's an old DOS trainer (only 232 byes long!!!!), which I found at a german cheat website, couldn't remember where, but spent half an hour translating websites :P
You can get it here:
http://rapidshare.de/files/2106580/MADTVTRN.ZIP.html
You NEED DOSBOX to run it. Open DosBox, type MADTVTRN.COM to get it a TSR and then type MTV toload the game.
ONce loaded, the money will never go lower than 9.999.999 millons.
Enjoy!, and thanks to Phoenix/TPC for making it!
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Edit: So small can be untrusty, so, I started to search again for it and found it. Got it from here:
http://pc.cheats.de/fixedcheats_173606.php?hits=1155