So, doing all the side missions still. Franklin's are rather dull in the sense that I am doing them and having fun, but they don't rise to the level of humor that the main story line did.
Trevor's on the other hand is gold. All of them.
Still enjoying this immensly but I do have a question for the guys that have a billion dollars................. how? Did you just do all the assassinations after the story or did I miss something? Even when I was playing the market for a few days without doing anything else I was only making like tens of thousands tops, not 6 or 7 figures. I'm stumped on this.
Stock market.
The assassination missions are an opportunity for huge money. I haven't even done most of them, but I increased my money by 7x on one of them. Buy the stock he says before the kill. Don't reload any saves until you've sold off at about 80% increase... if you reload a save it will max out at 50% even if it was above that when you made your save. Then put everything back into the stock that you killed off and wait for it climb back up.
Beyond that, it's still the stock market where I made most of my cash. LifeInvader is so cheap that even small fluctuations in price can bring you a big gain. I've turned 25% profit with LifeInvader by buying, doing a mission or two, and selling. Any time I logged out then I put most all my money in Pisswasser, and Hawk and Little since BAWSAQ will keep increasing while I'm offline. They were going up like 10% per day. I haven't been doing the stock market in a long time now though as I started getting close to hitting the max money bug.
For seed money, the hidden packages are very helpful. There's a blue dot mission driving a guy to the airport that gives you a stock tip that will give you 50% gain. Trevor hitting all 3 blue dot missions that let him take people to the cult gives you a nice bit of cash after the third one, I didn't keep track but it was probably $125k maybe? Returning a guy's stolen bike somewhere in the southeast part of town will net you a bunch of shares of free stock that I think I cashed in for $100k. Also the submarine/nuclear waste missions are decent money. Trevor's arms running in the airplane are generally pretty quick, I imagine they are probably one of the better repeatable money making missions.
I would say don't buy any properties early on. Maybe get Smoke on the Water and the submarine dock, but I'd leave the rest until I had a lot of money. It takes some of the properties 100 in game weeks just to break even. Far better to have that money available for the stock market.