I went through a similar process 3 times in the past 12 years, one of the problems for me, which is similar to what you are looking at, as a designer, much of the value, other than hard transferable assets were in my skills and my client list, which would not necessarily transfer. I found that the valuation process was tricky, since I had no desire (actually, no ability) to stay on and transition. In the end, I got much less than what my income x factor would have been.
Still, your reasons are solid. Sometimes, it is not about maximizing profit. I was getting more and more ill running my company, I had to get out.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."