DevonDiver
N/A
If you have no desire to get into a DM career, then there are other ways to get equal training without the risks/costs associated with having a DM cert (legal stuff like perceived level of care others could expect from you if they know that you are a DM, and it does not matter wether you have an official duty to them or not .. and insurance to cover things like the above)
It may be different in the USA, but there is no legal duty of care that come with having a DM certification. Even if that was the case in the US (the home of outrageous liability claims)...if you let your membership expire after 12 months and you are not 'renewed status', then you are no longer active or expected to function as a dm.
FOR THE OP.... another interesting option for advancement past Rescue Diver level is to consider technical diving. This training will expand your diving...and take your skill level to a whole other level. Technical diving isn't for everyone....but the training is fantastic.