Apologies also for adding to the discussion in the wrong place, especially since it appears to have finished before I arrived :)
Emily, I'm in exactly the same boat as you, I do the same type of work. My particular bugbears are calls to foreign mobiles, postage charges and website hosting, occasional travel expenses and hotel bills. Like you, I just absorb the charges rather than add them in order to keep it fairer for the clients. Every so often I think to myself 'Right, this is it, I'll start an EURL instead!'' but then the expense and hassle in doing that, along with ongoing administration time and costs, makes me decide against it, so on I go as an AE, better the devil you know..
If anyone in a similar situation has started an EURL I would be very interested to know whether have found it worthwhile, or regret the decision etc. In another separate discussion of course :)