Oh, I don't think that is so easy. He tried querying agents and they didn't respond. I don't believe he wants to wait for them. He did go talk to a lawyer who reviewed the contract with him and already negotiated the terms he wanted. I'll pass it on, but I don't that what you told me is enough to convince him that its worth his time at this point.
You're right, a contract in hand won't be an automatic, but it can really open doors - ie, agents much more willing to consider a potential client with a contract in hand.
And with a medium to large publisher, and especially a contract from one of the big name publishers, an agent will generally be able to negotiate an increase in advance sufficient to cover the 15% commission.
So, if your friend wants an agent for his future career, having an unsigned contract in hand can really improve his chances of landing one. And it's not really about what the agent can get on this deal, but landing one when you are more attractive for future books.
But, if it's a small press, chances are there is little wiggle room on the advance, and then it's not really likely to entice an agent. Is the advance less than $5,000? Then my take is that it is unlikely to entice an agent.
Plus, if your friend has already had a lawyer negotiate the terms, it will be hard to bring in yet another advocate without blowing the deal, IMO.
So, for future reference, I'd tell him to seek an agent with offer in hand, if the offer is from a press with room to negotiate and IF your friend wants an agent for future career guidance.
tell your friend good luck.
~suki