Note: Only proceed if you want to take the "evil" path. After agreeing to help Mr. Burke nuke Megaton, go into every single house and steal everything (any little piece of junk you can carry). Sell them to the local shops (Craterside Supplies, The Restaurant, Moriarty's Saloon, etc.). If a particular house is locked or you need a key to get into a safe or something of that nature, simply kill the owner of said property and get the key from his or her body. Kill everyone in sight, especially the shop owners because you can get access to their entire inventory, plus the caps that you have already spent on them. Kill every one and collect everything to leave Megaton empty. You should have at least 600 caps. Remember to sell some of the things you gather to the shop owners because you cannot fast travel when over encumbered. This can be done in almost any town you visit. To avoid getting over encumbered, get all the supplies that you can possibly carry, then drop the rest just outside of Megaton. Fast travel to Rivet City or some other marketplace. Sell what you have, then return to Megaton and repeat the process.
In the "Strictly Business" quest, capture Susan Lancaster, and get your reward for her capture. Afterwards, speak with her in the slave quarters part of Paradise Falls. Note: You will need one of the slaver's keys to access the slaves quarters; pickpocket one. After entering the slave quarter's, speak with Susan. When she asks for help, choose the option "You're a slave. Deal with it.", then return to Grouse to collect the reward again. Grouse will think that you captured her again. You can repeat this as many times as desired to get 250 Caps and a slave collar each time. Note: If you capture all four slaves and tell each one to "Deal with it", and then talk to the man after the initial time, he will give you another 250 Caps for each one. This makes it much easier to get large amounts of Caps instead of running back and forth with just one.
Save all pre-war books you found (not scorched or ruined). Go to the Arlington library. At the southeastern corner you can find an NPC that will buy those books for 100 caps each. You will also get 10 experience points for each book you sold.
Do the "Riley's Rangers" side quest. After rescuing Riley and escorting her back to her base, she will ask if you want to help her out by mapping the area, and that she will pay you. Do not tell her that you will help her just yet. After reaching level 20, use the "Explorer" Perk. Once you have revealed every location on the map, go back to her and tell her that you will help her out. Then, tell her you have got some new locations for her. Depending on whether or not you have already done it, you can make upwards of 2,200 caps.
