It's not necessarily a Minelab issue with respect to testing a 7k before purchasing, did you test drive the Monster
if not why not. If you want one made available why not every model, as with a 1 thousand dollar vehicle and a 100 thousand dollar vehicle.
Initially some dealers did have them available for hire and pre purchase testing. However when quite a few went walk about never to be seen again this option was made obsolete for obvious reasons.
Even after purchasing a 7k new with the current after market accessories you will need a few extra grand to be on par with the people finding large gold regularly. On top of all the extras knowing the machines abilities and the enhancement each accessory provides is the only thing that will put big gold in your jar at the end of the day. How many are finding big gold is a mystery that no one knows the truth about, nonetheless a 7k in the right hands is your best bet.