im sure no one buys low runes anyway, they are easy to farm and its much more worth it to just save up for other items to spend gold on.
this could just be helpful for say someone who just starts, or purely for convenience since anything under Hel doesnt really have alot of value and imo defiantly not worth spending gold on.
i think everything else in the shop is priced fairly. im happy with how it is now because i got a mule with 3+ of every low rune but just a suggestion.