Sometimes it is just easier to do the trade without a MM. Especially OMMs... they can be difficult to get a hold of and may not want to partake in the trade.
Being staff and an omm doesn't make you 100% trusted. If you can trust each OMM/Staff member with everything you have compared to actual marketers, look at feren silver.
I almost never use an OMM and generally refuse to. I handle bills every day. I've had omms willing to trade with me where they have gone first as well. Main flaw is, if you expect r2, h1j, video, Viou, etc to always use an OMM, because they have the rank, your truly stupid; espcially on trades involving billions.
You can't force somebody to trade a way their not comfrotable with. With this suggestion implented, it will cause mass havoc with very big OMM scams.
This has been suggested numerous times and it will continue to be denied over an over again. Please stop making ridiculous suggestions that have been made time and time again.
No support.
Edit: I'd also like to point out that I am not slandering staff/OMM's. I'm simply pointing out that the rank isn't everything. It can cause havoc and easily be abused with this suggestion.
No support, It's simply a persons choice to whether or not they would like to use an MM or OMM. Giving them a TwC for this is completely unjustifiable.