You ask if the wedding planner will get any referral commissions from the vendors. It is very essential that your planner does not have any relationship with the vendors, in terms of money. A truly professional wedding planning will never take any commissions from the vendors. You can imagine that the planning will try to push you to hire a particular vendor if he or she takes commissions from this vendor. You have to bear in mind that you hire a wedding planner because you would like to get professional and unbiased opinions on your wedding planning. The advices from a planner who takes commissions will somehow be twisted. As a result, you should never choose the planner if he or she accept referral commissions from vendors.