Stocks

I currently own 500k stocks of symbiotic. Is it worth getting another 1mil or are the benefits not worth it? 

FHG is better. But it's also a big investment. Sometimes building up with the smaller ones makes the more expensive ones easier down the line. But yes, a 2nd increment of SYM, even with the Xanax crash is still a very good investment. Also look at getting TCT, GRN, IOU, PRN, PTS and then move on to ones like FHG and MUN.

Check this post here to be able to see the best order for stocks for ROI

Wait, you can get 2 packs of drugs if you own two increments of SYS?

Every increment of BBs provides another of the same benefit at double the cost, so for SSYM the first costs 500k stocks, then the second costs 12m stocks, then 2m stocks then 4m ...

Most stocks aren't worth getting more than 2 increments (the main exception is MCS, depending on how you value e) as the RoI decreases (payout stays static while cost doubles), and around 20-25b worth of stocks PI rentals are a better return per capita (utility assholes notwithstanxding)

depends on the stock - while some do not have good roi, something like ASS and CBD combined together (2, 3 of each) can boost NNB (nerve bar) growth expeditiously 

you would get premium alcohol, that is on a booster when used, and CBD, which isn't attributed to booster at all, and they both impact nerve gain 

overall it depends on your goals! personally, i did the CBD/ASS stocks combo and go into PA, with 125 total nerve now (10 from merits, 40 from faction)

A second drug pack/week is worth the investment imo. Once you have your bank maxed, stocks are best for increasing networth. Focus on feathers when you are able, like Ohadik said.