There is a revealing account over on "Find's Treasure Forums" (note the name) with the equally revealing title: "The first Detecting Wales Rally ... gold and silver!" posted at the end of February 2009 by one "Welsh Neil". The commercial artefact hunting rally run by the "Detecting Wales" forum was a great "success". About 35 people searched ploughed land and grassland (not approved by the Code of Practice) and the finds from the pasture were described as "outstanding". The rally removed from the archaeological record at this point four Roman coins ("grots"), two Roman fibulae, a silver man's finger-ring, six hammered silver coins, five milled silver coins, a gold noble coin weight and a "gold quarter stater". As Welsh Neil said:
As far as I am aware there have only been 7 gold staters ever found in Wales. Its a historical find and needs to be reported!Once again we see the emphasis being placed on how much "gold and silver" is being found by these treasure hunters. Needless to say a search of the PAS does not produce any record of a gold quarter stater found in February 2009 - or indeed of any of reports of these rally finds coming in at all.
The "Detecting Wales" forum has run at least forty other commercial artefact hunting rallies since then. It seems that none yet figure on the PAS list of rallies contributing in any significant way to their database. Obviously then the majority of these finds are just being taken out of the archaeological record and disappearing into scattered ephemeral collections or onto eBay.