Yes, yes, yes and yes.
This comment came at the perfect time since it's something I've been thinking about all morning and it even relates to PCB's :-)
I think I'm the same way. I have bare boards here (PCB designed and came back from fab), a stencil, paste and trays of parts. AND a customer and a damn healthy profit margin.
So why haven't I assembled, tested and shipped the boards I should have almost a week ago? Well, that's the question and I think your answer crystallized it perfectly for me. The fun part of solving the problem and coming up with a solution is done. Actually building and testing these things is BORING and I have to force myself to do it even though I know shipping just two boards will cover this month's car payment.
I was thrilled and excited to ship the first ones: precision analog electronics, a four-quadrant multiplying DAC and a domain I enjoy working in (machine control). But now that we're up to Revision 4, I am so effing bored with it.