People often cite late 2018 as one of the few golden eras of CG besides 2016. You could go onto main street and find many types of businesses. As stun says, your FPS would drop from the amount of stores and buildings there. It was a completely different zone to what it is now. Money isn't changing hands enough anymore because people aren't incentivised to create the incentive to have it change hands.
The server's economy is going to be reset as the town hall indicated.
The economy is messed up. Having a functional economy in the first place is likely the preventing the same problems from arising in the new one. If the solution isn't renewable then it's a bad one. Just because you want to shoot things and regulate which shooting occurs when and how - it doesn't mean that the bigger factors that have led to this mess aren't in play. Helicopters and the various other spendables have failed in draining the economy. Unless money starts changing hands and players are encouraged and rewarded for doing so then you're going to face the same messed up economy within a few months. You can have a cops and robbers DarkRP, but supporting that third "citizen" style of roleplay will increase roleplay overall for all 3 major RP roles. Business is dead - and by declaring it a "non-DarkRP" prospect you're limiting the plays possible to sitting inside a base all day with the occasional vault raid or bunnyhopping around the map as a police officer.
Business Concepts that help the dynamic of DarkRP (selling checkpoints, HQ's and police barriers to cops and bases, defences and turret scripts to criminals) are not a detraction of DarkRP and it's plain ignorant to dismiss this as a CC concept.
The three primary categories of DarkRP in order of prevalance and importance go as follows:
Criminals
The most essential category. Without criminals there is no crime and very little purpose for the police. Criminals thrive when there are no police making this dynamic criminal heavy. There are almost always more criminals than police officers which is why the RP of more players depends on the management of this category.
In terms of the economy, this category is of the biggest detriment and serverside tweaks will only slow this detriment down.
Police
Secondary category. Provides security to law abiding citizens. Thrives in purpose from criminality. Has no purpose except community service without it (also rare on CG).
In terms of the economy, this category in theory should help players in the former category expend money therefore helping the economy - however players of this category usually play exlusively PD and rarely as criminals. Therefore criminals are still earning unholy amounts.
Misc/Citizens
Tertiary category. Provides services to both criminals and police. The ceiling for this category is so ridiculously high.
In terms of the economy, this category should be the one to cancel out the detriment from the first category. Criminals at the moment have nothing to spend their money on that's worthwhile. Maxnet scripting and unique business ideas that heavily involve roleplay are not only an economic remedy but also a golden ticket to create more RP ideas. More business ideas means an at least breathing stock market that players of all 3 main categories can make/lose money from.
THIS CATEGORY IS COMPLETELY DEAD EXCEPT FOR A FEW GUN DEALERS EVERY DAY
Honestly though - if you're going to dismiss concepts that only add to the dynamic of DarkRP and increase it's overall replayability with a "go play cc" then I'm not sure what to recommend. That's not a fair assessment. If you love to see excellent looking buildings, reliable services and those rare genius business prospects that pop up on main street every now and then then you shouldn't oppose this. Have staff create a top performing businesses competiton every month to kickstart competitivity and have a business highlights of some sort. People hate business because they open up a shop and get sniped by CGSF who aren't used to law abiding citizens or they get spam raided by criminals and find it meaningless to carry on as they were.
No changes to functionality, likely no addons or optimisations - just straight up community backed support and encouragement and competition. Competing market = consistent and higher quality services as well as economy resolving money drains that last as long as a person is in the game. And even when they aren't, somebody else will take their place.