on *:TEXT:!lstatus *:#: {
if($2){
if ($2 == on) { set $+(%,lotto,$chan) on | msg $chan lotto is now on }
elseif ($2 == off) { set$+(%,lotto,$chan) off | msg $chan lotto is now off }
else { msg $chan blabla not the right command }
}

; on top of the script:

if ($+(%,lotto,$chan) == off) { msg $chan lotto script is off | halt }