Fee only financial planners

In your opinion, at what investment amount or net worth is a fee only financial planner a better investment? I understand the inherent advantage of impartial advice as opposed to possibly influenced by commission advice but there would be a minimum amount at which the investment into such a planner is worth it i.e. if you are investing INR 1000 a month (random number), would a INR 15k price point be worth it (which is around the minimum charged by such planners). Or do you feel that over time the value of the advice would pay for itself either in terms of difference in selection of financial instruments or lack of commissions or something else. Any experiences with fee only financial planners?