In conjunction with the new great ideas cmong with the June 2nd update, I have an idea to make raids more appealing to many players.
Reducing the return time from 4hours is great. So is the practice attacking your compound, so you can test your defense layout. However, there are no valuable items that can be stolen in a raid, only fuel when/if the generator is running, which is almost never the case since everybody collects the fuel before going to sleep.
I suggest adding another storage building, which would be "item container" or "weapon box" or something like that. It could also be like a big container that trucks carry around.
When you loot this building, you would get one blue item, either weapon or gear or clothing, with the small chance of getting a rare or a unique. It would be generated by the game, not stolen from the defender's items (people spend real money for their unique long rifles^^)
Just my two cents. Looking forward to june 2nd update, and hope my suggestion was interesting :)