You can't have it both ways
I think the main problem here is people want to have it both ways.
By not stating how much they charge per port, there's the chance that some people will over pay, and they do. So in this case, porter will happily accept the extra payment and feels good about themselves. But the risk is that by not stating how much you want for your service, there are times people does not value your time and your service as much as you value them and we have the problem here.
How to fix that? Well easy, just like many people already said, just tell people how much you expected to be paid. But doing that would mean that those future "big tippers" will just pay the standard asked amount. But that's the risk for that.
You can't have it both ways.
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