It all depends on what the people are into.
Some guys like shorter times. Quantity over "quality", though an argument can be made about the quality aspect.
If a person is looking for GFE and have a 30 minute appt. they would think the quality was not good. But if a guy is looking for PSE 30 minutes, the quality could be amazing. It all depends on what people are looking for.
Providers have the choice to offer that type of appt or not. Whether they do or not, is entirely up to them and I don't understand why any type of stigma would be attached to those that do.
I think the 30 minute appt works well for guys who are not able to "disappear" for hours at a time and not account for their time.