I should probably just stay out of this, but it makes sense that you wouldn’t shorten, then place a “(more…)” link in a “BB Shop” post. If you want to sell stuff, you want to get it out in front of people’s eyes. Who’s going to click on a link to view what’s essentially an ad? Some people would, but (reading how many gripes there are about ads) not very many. It actually makes sense to use the in-line posts, since they can’t be hidden using ad blockers.
I use the “boingboing.net/blog” view also, but usually on a desktop monitor, not my phone. I have my own issues with BoingBoing’s ads, but not the in-line ones – I just scroll past those if I’m not interested. Call it the price for getting BoingBoing for free.