Greater Seal of Health Regeneration (Yellows) are a joke why have them in game?

Greater Seal of Health Regeneration 0.56 health regen per 5 sec.

Greater Seal of health +8 max health.

0.56 per 5 sec equals .112 health every second.

If my math is correct it takes 72 seconds (1 min 12 seconds) of you being below 100% health for this seal to break even.

I doubt anyone uses them (and for good reason) so this is probably all inconsequential but why have them then? I realize Riot doesn't want people to just ignore early game harass (thats why they messed with potions awhile back) but these runes are really terrible.

Don't even get me started on the scaling health regen ones...