Anecdata, I know - but certainly even 5 years ago it was rare for me to spot a forgery in my change. Over the last few years I found more and more - so I'd think that the process and cost for creating fakes is dropping. Though since contactless payment has been around I can honestly say I've spent actual cash about 4 times this year so far, so my collection of 'interesting coins' has not been added to like it once was.