Well lucky for me I have no problem with exploiting the glitch. I figure if it's in the game and doesn't require a cheat it's fair game. I started a new game and used your tip about the boat with the scuba gear and got both Michael and Franklin in position and in about an hour racked up $4 million for each of them. I've only just completed the Jewel Heist so I don't know how much return I am going to get on the combied $8 million bucks I racked up. And as per your advice I'm still going to wait until I've completed the main story and then do the assassination missions so I can invest each player's $30+ million bucks in the stock market and see just how much of a return I can.
1. I don't like to abuse the glitch2. Collects all hidden packages go towards 100% completion(unless you dont care)3. While traveling around you will encounter heaps of random events(including the kid with stolen bike) and Armored Truck
Re: Hidden Packages Instead of wasting all that time going all over the map to get the hidden packages why not just exploit one of the respawning underwater breifcases that nets you 9-12k in the time it takes to switch characters over and over again?
When I tried this before my character kept swimming away from the respawn site, so I had to keep swimming around to pick up the money. Took me an hour to make £1m. Is there a quicker way?
So far I've only done this once (I'll try to do it again just see if I just got lucky or not) but when I did it they only drifted a bit from the case, never outright swam away from it whenever I switched back. I did this as soon as I was able to switch between Mike and Frank when I started replaying the game a second time.
I'm more than halfway through the game so I'll try it again and see if that has anything to do with it. I also made a separate save just after I had gotten them up to $4 mill each so I'll load that save and try the trick again there too.
EDIT: For those that don't know there are more than just 2 briefcases from what I've learned, and they all contain different amounts ($25, $20, $11 and $9 from what I've seen). And don't quick-save when you do this, just wait until you're done then save.
Here's the $25,000 one:
Here's the $20,000 one: