Honestly, I’ve bought 50 over time. It is much more convenient for myself and that makes it valuable to me. It’s just a matter how important dupes are to you and how you feel about 1 feeder at a time. What else would you spend those gems on? If that outweighs this, then save them.
As a P2P & Hoarder, I have bought heaps of extra slots (think i got 220 or something now).
Worthwhile? Possibly… After playing for more than 1.5 years, I have definilty got more than 90 levelled heroes across 3,4 & 5* heroes… That doesn’t include the space needed for feeders after collecting & before levelling (need 10 spaces imo)…
Yes a hero storage locker, somewhere to park my duo guardian owls and mok holding hands with Quintas along with other duplicates and heroes you will get around to leveling one day, scrolling through endless heroes and now with the addition of series 3 that you want to save plus I do one costume and a duplicate of them all it’s getting massive. Happy to buy for small gems just like extra slots, cmon make some more money outta me