creepingnet is right.
Personally, I started collecting vintage computers because I love them but also because it looked like a cheap hobby to me.
However, as time went on, the demand for items like real MPU-401, SoundBlaster MC, Gravis Utrasound, original IBM PCs, etc... grew and I found myself spending 100s of Euros on such items.
What makes me sad is that it becomes all about profit and for a normal collector totally irational.
I had the luck to buy some items in about 15 years ago when I was a poo student.
Back in the day, I got a LAPC-I and a SCB55 on its MPU-401-AT each for less than 100€.
Today, this would be a good deal I guess.