Is there any real use of expanded A4000 with some PPC turbo card? I can understand that some collector would want it and cash-out big bucks. But talking about faster access times and MIPS... I don't see a point!? This is all history and only a hobby for most of us. A few % performance increase in most cases doesn't really matter.
But I guess everyone has its own interests and in most cases decisions are really not rational. Then we see skyrocketing prices