Funny, it is same discussion we had few month ago when i introduced AtomicFe with this feature.
Concerning MAME Cab in a exploitation context. There are lot of in Spain and Italy too.
And i saw one in North Carolina in U.S.
Some PCB are sold including MAME and 400 or 900 roms too. They are JAMMA board with a Hardrive, you just plug to your Cab , and you boot up directly on a FE (Arcade OS , i think). And you can choose up to 900 games runing with mame.
The credit management is done by electronic.
These boards are called "900 in 1" , and "400 in 1" . You can find some of them on Ebay sometimes.
Boards are made in china.
So, i don't think credit management in FE will change something.
Personnally i decided to put in "stand by" the coin management from the FE in Atomic. Just to avoid polemic and be concentrated on others features.
I agree with lot of you. It is not necessary at all to have a coin management from the FE , but it is just for fun and for a little more "arcade" feeling in a mamecab.
And from my personnal point of view , it was more for the technical aspect i wanted to do that.