I have 10 rune pages, all of which were bought when you couldn't edit your runes during champion select. They weren't for convenience then, they were an advantage.
When the switch came out and BE was partially refunded for purchased runes and rune pages, I lost a net of about 30K Blue Essence in invested value (I believe the partial refund was about 50% and I got about 30K Blue Essence back). The runes are all gone, but the 8 extra rune pages are what I have to show for it.
I got a small advantage for about 2 seasons, and it cost me 30K Blue Essence. Now I get a convenience.
I think it would be a bit of a low-blow to now devalue that convenience as well. Especially with role-select now, where you can queue for 1 of 2 roles. Fill out the two pages you have for the two roles you will queue for and the champion you feel like playing in each of those roles that match before you queue up. Then only in cases where you got filled or your pick was picked/banned would you need to change (and if you're counter-picking or flexing your champion pick, then even with more rune pages you would still end up editing them in champion select).