Sometimes guys are checking services offered, they've seen the website and also may want to make conversation just to break the ice. These aren't however to be confused with those who make contact asking a long list of more, and more detailed questions which aren't appropriate or necessary.
Specialising is a term I associate with parlours. Studying parlour websites I have seen services such as kissing, dfk, 69, o, owo, gfe, cim, different positions,A,roleplay,sub,dom listed. I also believe 'speciality' can also denote services for which there is an extra charge-although some refer to these as 'Extras'.
Since I offer a fully inclusive service, including many of these activities (but not all) as standard I find it difficult to answer the 'speciality' question.
As to whether or not I come with a client, well I usually say I haven't a clue.