幸运奖池：无人中头奖则奖池滚存翻倍

-- 错误：奖池固定值，不累积不滚存
local pool = 50000

local function drawLottery(p)
    local pool = tonumber(getsysvar("pool") or "50000")
    local round = tonumber(getsysvar("poolRound") or "1")
    pool = pool + 2000
    local hit = math.random(1, 500) == 1
    if hit then
        giveitem(p, 9601, 1)
        setplayvar(p, "GOLD",
            (getplayvar(p, "GOLD") or 0) + pool)
        sendcentermsg(0, "头奖 " .. pool .. " 金被领走")
        pool, round = 50000, 1
    elseif round >= 5 then
        round, pool = 1, 50000
        sendmsg(p, 1, "满期重置，保底已派发")
    else
        pool = math.floor(pool * 1.5)
        round = round + 1
    end
    setsysvarex("pool", pool)
    setsysvarex("poolRound", round)
end