I dont actually understand how come did you lost that amount of money but if its so as others talking that you bought weapons and because of the restart you lost these weapons isnt actually nones fault as there is nothing that writes that you should keep the weapons always and even after the restarts and none willing that it will be saven. As in single script of SA:MP your weapons actually wont be saven after logging out or after server restart, in Argonath weapons usualy be saven after logging out but it wont work for the restart. GameMode Restarts arent attacking the server because of bug, no. GameMode restarts usualy fixes something or updates something and mostly it comes randomly and theres is actually no way to sue the server because of the server restart.
Ofcourse i know how you would feel after something like that but we gotta keep the positive thinking and live with it.
I hope you understand and be positive.