You can already get enough from sgs as is so just buy those.
If you already have all of those, like I do, just sell off some junk.
If RS3 gave max bank space for free with membership like OSRS does, maybe people wouldn't be complaining about the lack of bank space, since the paywall for it in RS3 is insanely expensive
($85 for less than double the bank space? You can almost get gold premier club membership for that price instead, or entire games from other gaming companies)
considering that you're already paying a monthly fee and how much of a core feature the bank is (= quite literally every single player fills their bank with lots of stuff, from PvMers to skillers to questers etc). And don't even bother trying to claim that "Jagex needs to make money", since that's what the membership fee is for, and the less aggressive MTX there is, the more paying members there will be, which equals higher membership revenue in turn.
But even besides that, if Jagex was able to add even more bank space than what's currently offered, why would they not do so? As long as the maximum amount of bank space is less than the amount of items in the game that can be banked, you might as well add more room if possible, since it's more convenient to store more stuff you might need than being forced to discard them and then fetch them again when you need them again.
"As for forktails, bait them thusly: pound a stake in the soil, bind a goat to it, then hide ye in nearto shrubbery posthaste."
If you want free bank space so badly, then ppl should play osrs.
On rs3 you have to work for what you want and nothings given to you on a silver platter.
It's the opposite way around. In rs3 you get everything handed to you on a silver platter that's why we have th. Bank space in osrs isn't handed to you on a silver platter, you still need bank pin and auth for full bank space. It's not that everyone wants free things, It's just that basic features shouldn't have a payment option. Osrs is the game with less easyscape.