If you want what amounts to a bookkeeping service, the price should be low. Fuller services will cost more. Captive management is a competitive business and fees are usually in line with reality. But not always. Your manager, like any other company, should be aiming to become more efficient.
Some captive managers offer new clients a rock-bottom price that seems to good to be true.
And it is. Also, watch out for broker-controlled managers that offer captive services at severely reduced fees. Finally, check references. Al most anyone can talk a good game. The best way to really find out is to seek out client references.