I have to agree with the general consensus here.
He is a LAWYER mate! Do you have any idea how much just one client is worth to him??? Do you?
If you do, and you still want to charge a paltry amount, get out of this business - it won't work for you if you want to make a decent living. Better still, JV with or hire a salesperson / Business development person WITH EXPERIENCE who can manage and charge out the business while you stay at your computer doing the science!
If you don't truly understand how much a client is worth to him, then you need to re think your approach to taking on your own clients. I won't go through my whole method here but put it this way - my initial meeting takes a client through a process that finds all sorts of problems / opportunities / solutions with their business. A big part of that is working out the lifetime value (LTV) of their typical client. Clue: Lawyer's clients have a very high LTV. That's not just one transaction, but all the transactions that they're liable to with the lawyer over time.
Just to give you an idea, my initial consultation, before I've even discussed solutions and services, takes about 2 hours. That's a lot of provoking and leading questions about their business from me, and even more listening carefully while they talk themselves into my services, I mean tell me all about the facts and figures of their business and it's marketing practices.
When you work this out, and then how many of these new clients you can bring a lawyer using whatever methods you use (SEO being one of them), then you - and most importantly he, will start to really see how much your service is worth. Further, your offering becomes a cost-neutral no-brainer for him as - if you can deliver X new clients per month that earn him $xxxxxx then as long as you service is still less than that, he's making a profit (I'm oversimplifying here, but hopefully you get the point).
In addition to this there's one other very important point about charging - it directly affects your positioning. Lawyers and many other professionals live in worlds where everything and everyone has high $$ prices. If you come in and allow them to nickle and dime you, or don't have the confidence to charge reasonable prices, then they will never take you seriously, nor truly value the work that you do. If you had a major court case and needed hard core legal representation, and some guy came in and said he's only charge you $25/hour, would you take him seriously? Didn't think so.
Hope some of this helps. Not meaning to put you down at all, just want to have you realize that you have a very valuable service that is worth a lot of money. (This is all based on the fact that you can actually deliver!)