The WordPress economy is maturing now and we are starting to see more acuisitions, mergers and sale of whole line of products and brands.
DevPress and Themelab got sold out recently.
Press75 tried selling unsuccessfully through Flippa
The interesting part is none of the guys are selling them at the peak of their business unlike how software companies do.
When you are trying to sell when you are no more interested in the product, the recurring revenue is in a declining trend and doesn’t get the prices these products truly deserve.
The future might see more such ventures.