First I have a legit(no coin, no botting) 13 set and am working on the 14 though I only have 1 as of yet. I have only recently begun working toward that goal. Here is how I farm 30 blue per hour and ~90 delicates.
Step 1: Find areas with npcs in close proximity. There must be 4 within 2.1 miles of the flat. Then port a city there or build one. Repeat this with ~7 of your cities.
Step 2: Convert all the npcs to lvl 5s by conquering them and porting them from there flats. This is costly in teleporters and is the main limiting factor for a non coiner you may be able to get help though as coiners have alot of extra ports usually.
Step 3: Fill Your fh with junk heroes. lvl30+ is better if you have a 9 set to reduce warrior cost. Remove all the hero mounts to allow for even timing on your hits and use int gearing otherwise.
Step 4: Send out waves of 100k war to each of the 4 npcs around each city. In 6-7 minutes repeat this process again. Use an Ipod or some timer to help and never hit sooner then 6m as it cuts into your drop chance. I prefer to wait 7m to ensure that does not happen.
The cost in war starts out high at about 5k on the first hit but it drops to 500-1k eventually once the wall defenses reach there minimum. Excluding the initial hits the cost is 40k per city per hour. It seems like alot but thats 1 or 2 ques per hour depending on pop. The heroes' energy is good for about 5 hours and then you need to dismiss and replace. If you have level 5s right next to the city at 1m you can use a normal ballista wave instead but anything further will not be fast enough to keep up with the item regen on the 5s. I am a big fan of warriors and have ~60m. This is part of the reason why.
Using warriors is not required to get gems from the 5s. You can send a double hit of mechs once every 40 minutes for good results. The warriors however accelerate the gain rate at the cost of troops and alot more effort. Expect 7-9 blue gems an hour from 28 lvl5s in an hour using mechs.
I have heard it said you cannot get a 14 set without coining. Thats bunk. It can be done it just takes a massive commitment. I prefer to have 500 blues and plenty of delicates before starring so I have a good chance to return to lvl 12. I auto everything but the first attempts. Flawless from 7 stopping only on a fail to 0 to use 1 red for that upgrade.