A) Very little. Expenses only I think. Maybe not even that. I honestly don't know for sure.
B) Don't know. Highlights get shown on local TV but I've no idea if clubs recieve monies for these highlights.
C) They play at an 8,000 all seater stadium which they share with local rivals Deportiva Lorca. As far as I know, no other events happen at the stadium but there several floodlit, 4g pitches in the stadium complex. The main pitch is grass - a rarity at this level in Spain.
I know costs vary but these differences are huge and for some people, could make all the difference between watching live football and watching telly football. The prices for top level football are equally as huge but the other way here. €100 for tickets is common for La Liga matches.