Sorry, but either you only have like 6 roms or you stole them because they are NOT free. You have to pay for legitamate copies. And if you do own the license than it's totally legitamate to sell a MAME cabinet. See Hanaho. 
Joseph Elwell.
I have purchased all of the ROMs available from StarRoms.com (roughly 30-ish at last count). But as Howard mentioned, there are plenty more that I *WANT* to purchase, but cannot.
And as I've questioned on the MAME.net forums, if I cannot:
1) Locate a game board for purchase
2) Locate a legal ROM distributer to purchase from or
3) Cannot purchase an arcade-equivalent port on another console or computer
What options are left for me if I wish to play the games?
I *WANT* to pay for the games I play. This will only encourage more game distributors to start up licensing of their older games for people to enjoy. Yet despite all the ugly name-calling going on (we're all dirty little pirates, apparently) and despite all my pleading to large companies to offer me legal games to purchase, they still do not let me do so.
So what is the suggestion from the peanut gallery? Where can I turn to if I can download the games, yet there is no available path for me to take to in order to actually purchase the rights to play these legally?
Capitalism and copyright law is all good and find for modern items being sold to Joe Sixpack, but for collectors of digital information it falls rather flat. I don't have the silver-bullet answer either, but a good start would be for companies like Capcom, Taito, Midway, etc to on-license their classic games in bulk to resellers like StarRoms. I'm certain the effort on behalf of the large organisations would be minimal, and that StarRoms are more than willing to take part. (In fact, from my conversations with the StarRoms guys, I'm more than certain this is so). The missing part is the willingness of the large corporates to put their money where their mouths are, and instead of labelling us all pirates, offer us a chance to purchase the games we are "stealing".
Truth be told, I play all of 6 of the 30 games I purchased from StarRoms. But out of sheer principle I purchased the entire stock. Hopefully if more people do the same, it will give StarRoms the purchasing power to buy more games en masse and extend their offerings.
So, did I "steal" my games? Have I deprived anyone of profit by playing the games I do, if those games are no longer for sale? I own several consoles, with legally purchased ports of the modern games I play. I don't play these in ZiNc or other newer-system emulators (MAME is the one and only emulator I use). I've purchased everything I can from StarRoms.
So where do I go now for the 100 or so games I want to play, but can't buy anywhere any more, nor play in my local arcade?
Back on topic:My apologies to the OP if they took offense to what I wrote. I did not intend to label you a pirate. It was not intended to sound that way.
My concern is that any coin-counting software, while certainly able to be used legitimately for home users, will only end up being used by the less-than-honest people out there. Don't assume just because something *CAN* be written that it *SHOULD* be written.