Click()
            if(t=="Buy")
                var/tt=input("What would you like to [t]?","Choose an item in list.") as null|anything in list("Cancel","Food")
                if(isnull(tt)) return
                if(!usr || !usr.client) return
                if(tt=="Cancel")
                    usr<<"Thanks for coming to Hairy Lary's marketplace!"
                    return
                var/ttd=tt
                if(tt=="Food")
                    tt="fo"
                    var/ttt=input("How much [ttd] do you want to [t]?","Going rate is [vars["market[tt]"]] per [ttd].") as null|num
                    if(isnull(ttt) || !usr.client) return
                    if(!usr || !usr.client) return
                    var/tttt=ttt*vars["market[tt]"]
                    var/answer=input("it'll cost [tttt] for [ttt] [ttd], are you sure?","Are you sure?") as null|anything in list("Yes","No")
                    if(isnull(answer)) return
                    if(!usr || !usr.client) return
                    if(answer=="Yes")
                        if(ttt<=0)
                            return
                        if(usr.money<tttt)
                            usr<<"Sorry you don't have enough money, come back again when you do!"
                            return
                        if(usr.money>=tttt)
                            usr.vars["tt"]+=ttt
                            usr.money-=tttt
                            usr<<"Thank you for your purchase of [ttt] [ttd] at a cost of [tttt]!!!"
                            return
                    else
                        return


is it ok doing this?

I do it because vars[] allows me to EASILY edit something...

but I'm not sure if there's problems that will arise by using it?