Collector boosts should also give shields
I just had an idea for how SC could sell more collector boosts: have them come with a shield.
A lot of players don't like to pay to boost their collectors, because they think that most of it is just going to get stolen anyway. That wouldn't be a problem if boosted collectors were shielded. There are a number of ways this could work. It could be that loot in boosted collectors is 100% shielded, or that they could still be raided but only for 25% of what they hold. Another possibility would be to give a partial shield to storages if all collectors of that type were boosted.
I expect someone will argue that this would her the economy. I don't think it would have too much of an effect, because it would cost about 200 gems per day to boost all of one's collectors, and most players won't spend that much, so there would still be plenty of unboosted collectors to raid. Still, enough players would use it for SC to see a nice bump in gem sales.