99.99% players don't need more slots.
They use dual login to level low alt using high one.
If they were on single account, it would be impossible to login them together.
Making new account is easy and fast, so more slots on single one is luxury.
For example, I have several accounts, four toons on each.
I don't need fifth toon on any of them.
Let developers use the time on something more important (as they already do).
Thank you, people, for your hard work on keeping this server up and running so well.
You are the reason this wonderful community exists.