The comment about making software run 100% stable on AOS was more a general comment about old software.
And comparing sales and availability today vs 15 years ago is a bit hard.
Id imagine the cost overhead selling thru a Online Store is much cheaper than with Floppies/CDs like in the past. Plus then people had to order thru mail or get it in a shop.
With Online stores people are much more likely to do impulse purchases with stuff they MIGHT need cause it looks "shiney".
Yes, the active userbase was much bigger back then, but Id say Amiga vendors/developers can access customers much more effectivly now.
BUT Im not the guy balancing the spreadsheets. AmigaKit runs a buissniss with salaries based on Amiga platform. To have been able to make it viable for so long, he/they must have found a balance between expenses and income. If not; a company will inevitably go bankrupt (yes, I am aware that Trevor does have a healthy economy from activities outside Amigaland, which makes acqusitions easier/safer).