Class and income level are two different things. Some of the classiest people I know are dirt-poor. Some of the richest people I know are downright scumbags. And everything in between. IMHO, the definition of 'Classy' is a lot like the definition of pornography - "I can't define it, but I know it when I see it."
That being said, in the hobby world, 'classy' for a provider can take on some new meanings:
Are her TCB skills good?
Does she show up on time?
If she has to cancel for any reason, does she inform the client ASAP to minimize wasted time?
Does she always do her best to take care of the client's needs?
Does she provide excellent IOP?
And for the Hobbyist, some of the same apply:
Is he respectful to the provider?
Is he on time?
Does he try to negotiate rates?
Is he has to cancel for any reason, does he let the provider know ASAP?
etc., etc.
It really comes down to something we all at least should have learned in kindergarten:
"Do unto others as you would have them do unto you".
(although that might not really apply to a hobbyist when all he wants is a blow job - it might give him a reputation he doesn't really want...)