While I have no idea how TPL runs things.....

I can add this....I was an accounting manager at a large law firm in Boston for a few years in a previous job. Everything, I mean everything...down to the cost of making copies and phone calls were separated on a client by client basis. Clients that had multiple dealings with us had each dealing billed separately. Again, while I have no idea how TPL runs things.....I would assume (IMO) that they keep costs and revenue for different products separate.