The total cost of my darkroom gear was about $300 back in 2002. Since then I've added a second Nova 3-slot B/W 8x10 processor and an 11 by 14 Nova 4-slot processor - which needed a crack repaired. The two enlargers reside on or in a roll away cabinet and the slot processors reside on a cart for a microwave oven. The capital costs are fixed, there are no needed hardware or software improvements.
If I only did 35mm a transition to the electronic / digital darkroom would be easier, but alas half the time, I prefer medium format photography, especially 6x9.
The cost to transition is a bit prohibitive for me at the moment, seeing as I'd like to own a Nikon Coolscan 9000 scanner, high end desktop computer, printer in the Epson 2880 range and update my present software.
The trouble with my traditional B/W darkroom set up is that it still works, does not eat much cash flow and rolls into the back portion of my walk-in closet when not in use. The digital B/W work flow beckons, but for now I'm content with color prints from my two digital cameras printed on two archaic dye-sub printer which were bought second-hand.