As I have mentioned many times before Guild Wars 2 is a fantastic MMORPG that you can download and play almost all of the content without paying anything. There is no monthly fee there is no cost to buy the base game. This is the best deal running as far as trying out new MMO's are concerned. I ended up paying nearly $40 to try Final Fantasy Online and in the end i found it incredibly boring. That being said GW2 is a good one and you don't have to buy anything... ever. However most people end up buying something. This is something you don't need.
The Silver Salvage O Matic never runs out of charges but you must put money into it every time it is used.
you don't actually put money into it, it is automatic and takes it from your gold stash automatically. There is a really big problem with this thing and that is that the increased opportunity you have to acquire rarer materials (25%) isn't worth it. The "rarer" materials are mostly junk also and can't be sold (in most instances) for the amount of money that it costs to use this stinkin' thing.
This is not to be confused with the Copper Salvage O Matic, which is one of the most useful items in the game and it costs I think only 6 copper per use whereas the Silver Salvage O matic costs 10 times that much and mostly you end up with the same stuff in the end.
There might be some temptation to spend your very hard earned gems on this thing because it normally ends up being quite cheap and for good reason... no one who knows much about the game would ever buy it.