(adsbygoogle = window.adsbygoogle || []).push({}); This tutorial will show you how to sell duped adders for the full price of $735k (fully upgraded) every 4-5 minutes.
Prerequisites:

Fully upgraded Adder from Internet that sells for $735k
If you do not have one, get someone to dupe you one using apartment swap method, but make sure you have purchased a Rebel for $3000 from the Internet in the slot where the Adder will be duped to.
A friend in an invite only session to watch your car.

Tutorial:

1. Have a slot in your garage that you don’t need, and buy a rebel off the internet for that slot.
2. Drive your adder out of your garage, and make sure your friend is watching it.
3. Preform the Insurance Glitch/Game Store dupe method (Steps a-c below):
a. Get out of your adder, make sure your car setting is on “Everyone”
b. Walk away from your car and then go to the gamestore.
i. If you were host of the session, get someone to invite you back, and accept the invite from the game store.
ii. If you were not host, simply back out of the gamestore and you should be put back in the same Invite Only session.​
c. There should be one adder with a Personal Vehicle logo, and another without (your old one). Try to get into your old one. If it’s locked, gamestore and backout again. If you can get in it, good.​
4. Once in the adder that DOESN’T have your PV logo, drive away from your garage/PV and call your mechanic.
5. Request the rebel that you bought earlier. Once the mechanic delivers it, leave it there and drive the adder into LSC.
6. Sell the adder for $735k
7. Once you leave LSC, head back to your garage.
**DO NOT GO TO YOUR PV LOGO ON THE MAP. IT IS A FAKE PV AND IS NOT YOUR PV ANYMORE.**
8. Pull a random car out of your garage to fix the invisible adder/glitched PV logo.
9. Buy another rebel (Should NOT ask you to replace, as the previous rebel was deleted when you sold the adder).
10. Drive random vehicle back in your garage, and pull out the adder.
11. Repeat from step 3.
12. PROFIT