Very familiar. If its not a client I have previously played for or a type of (social) club I have basic prices for, I ask what date they are looking for and the budget they are working within in the same sentence. Then I can let them down by saying I'm booked rather than the truth, that what they are offering is not going to get most live musicians out the door.
The non callback/response thing is irritating. I would rather get 20 negative answers from incoming requests or promos I send out than no reply. Especially when it can be done via email that takes away possible awkwardness. I can remember one client that does a big annual event I solicited them for, who responded they were booked but would consider my band for next year. They actually did so and contacted me..but I was booked this time. But their follow up is the exception not the rule.