Since silvervine prices are going up and up every day, you should change the silvervine quest.
And i don't mean only changing its earning cap per month. Make it more interesting, like the Amistr Bag quest.
My suggestions?
Require zenys + items;
Kill different monsters - not only mini bosses, please;
Raise earning cap (high cap per month, medium cap per week/per day);
The possibility of us creating silvervine boxes (again, requesting a lot of zenys, even some extra items) - this could help the zeny sink problem.
This could prevent a lot of players quitting the server because of market prices.
Today 100sv box already costs 4m (or even more). How much will it cost after tomorrow's maintenance? How about by the end of the week? 8m-10m?