When I looked at the postmates site I checked it for Houston. I noticed that for around 40 restaurants the postmates charge was $3.99.
if you delivered using one of those deals then your cut would probably be around $2.50 right? I dont understand how you actually could make $6.00 per delivery from postmates. What would have been the charge from postmates for the customer? Like $10?? If that is the case then that right there is why you are not getting tipped, From a charge that high it would appear that tipping is included.