Most caterers of parties here have a promo for repeat order of service within a 3-month period. So for the second contract of catering, the client gets free drinks and dessert. That is a good bargain especially when the party's guests exceeds 100 people. I like this promo because we have an upcoming party at the end of the month and surely we will get a catering service.
We also have similar services available here but we get those items on discounted rates rather than getting them totally free. Maybe, your service providers keep rates of the items higher than ours but our service provider can not afford that since we have a stiff competition among our service providers. I think it all depends on the margin of profit.