The extra 1-2 storages you can get every single raid means it is well worth it to upgrade those heroes. They will influence gold farming in a big way.
Printable View
do you know how long it takes to up a hero to 30+?? more than 6 months! that's 6 months of constant upgrading without using them! its like saying save your money till you are age 70 to spend them, god know if you are gonna live that long and its awful feeling to focus your attention on something that you can't even use in a long long future.
Is this what you mean by constantly upgrading heroes?Attachment 84700
Meh that's no fun, sure you'll get level 40s eventually and they'll be awesome but you'll be miserable until then. I take my heroes slow upgrade them when I can but I hate not having them for war.