[dev1019] Why not increase the number of retainers or storage/sale space?

[Impulse]

I thought SE intended to have like 6+ retainers at some point regardless? Weren't they going to charge $2 a month for them?.

That's exactly it: They're going to charge for extras beyond the initial two per character. Not everybody is going to be willing to pay the premium for extra storage space, especially if they're going with multiple characters already once they start charging.