For me mining and farming are both boring and ive tried selling stuff but hardly any buyers, loans are not for me either. i need some new ways of making money so i want anyone no matter how lame it seems to post what they think is best for me to make lots of money, that doesn't take much work either but im prepared to put the effort in to what ever ideas anyone has.
I think fishing should become a viable way of making money as well as woodcutting and Large scale Merching.
Yes, however fishing can be a hard/waiting game, and fish is only worth $10, it used to be more. For fishing tips go to http://minecraftwiki.net/fishing
Get an eff5 for3 unb3 dpick and good dshovel. Go to y=10 or thereabouts. Mine straight ahead in a 2x1 tunnel, collecting every single ore. Sell your xp, diamonds, gold and emerald to other players. Do sell hand with everything else (coal, blocks, redstone, lapis, iron). Mix in superbreaker to boost your $ per hour.
I make most of my money by using my spawner and farming exp. Once I get the exp I enchant diamond axes and make them into Pumpkin Axes (EFF 5 Unb 3). After this I sell the pumpkin axes for 9k each.
Nether warts! get 2 rows of 50 soul sand, one row of flat stone or dirt or whatever in between, invest in a fortune 3 tool and farm away, i make 15k a harvest of of my temporary farm, and im building a 200x200x5 so ill make millions!
I have a setup that's 30x30 with 9 floors... It takes one hour to farm and replant the 9 floors, with a profit of about $1350 per floor. This makes about 12k/hr, as Nwart grows very quickly, and that first floor is just about ready for harvesting by the time I'm done with the 9th floor. I've found it far more profitable than Pumpkins since I don't have fly/speed.
This is my method. I got from Builder to Mayor in about 2 weeks, really 1, being as I was on vacation for the second week. AND, I had around 50k after getting Mayor. You can make 10k an hour with the Eff 5 Fortune 3 Unbreaking 3 Diamond Pick, plus I find it a bit more entertaining than walking in a straight line and collecting pumpkins or melons (personal opinion). I generally try to find an unexplored cave system, mine it, and when I've cleared it out I strip mine. It's insane how much cash you can make in a small amount of time. Plus, you don't need a farm or pump axe/melon sword. So... Quick calculation, if you mine for 4 hours a day and get an average of 10k per hour, you can get 1,000,000$ in 25 days.
Take out a 350k loan for a "melon sword" then do /lot buy 350 during a crazy lotto and hope to MHXL that you win big.