Money can also be made while monstering. They will offer to pay you either in gold or a portion of an osp (think you get a stamp per monstering slot and 10 stamps gives you an OSP but I might be wrong)
Money can buy you lots of things
1 - potions, poisons, weapons, armour, shields. Pretty much anything with a lammie as long as you have enough. Also if you have a craft skill it costs you gold to make items too.
2 - ritual slots. If you want to power yourself up lots and lots often a ritual is the best way to do it. If you're not part of a group/faction with a lot of ritual power and they aren't willing to help you out you can hire yourself a ritualist and a contributer and buy a slot if there's a spare one.
3 - stuff. All the way from the kind of things that Peggy sells, such as weapons, clothes, disguises (for hire), to jewellery, some sweets etc.
4 - services. IC services can range from bodyguards, assassins and brothels. (Insert plug here for the Officer's Mess :D)
See gold can be very, very useful.
IC - Major Drawback; 95th Foot and Mouth; Viper
OOC - Shirley Wynne; Dublin