The printing company I use have specific printers that only print for srgb format. They do an excellent work and never had any colour issues etc.. But yea most use rgb, but thats the thing. Clients wont know oh wait these pics are in rgb lets not print here or lets go there instead. I do tell them not to go to bigw etc, but sometimes its more convenient for them.
CYMK - is what my company does. Commercial printing. We have 4 massive tanks with those 4 colours. Not sure if this will be ideal for small companies hmmm..
Anyways.. yea i always give rgb to clients, but most dont know the difference.. all they see is high res files (rgb) look different to resized ones (srgb).
So my question is purely based on clients and what you give them!! Im going to talk to some colour mangement experts at work on monday and find out. Will let you know what they say. I just do I.T stuff at work, so never deal with that side of things.