I wouldn't want large numbers of Sentinels around. (That's why the future of "Days of Future Past" sucked so much. )For Marvel, robots like the Sentinels could be adapted to automate virtually all manual labour and transform Earth into a post-scarcity civilisation.
Seriously, however, you're right: having intelligent machines would wipe out most manual labor. (I see mass unemployment, not quite "post-scarcity", myself...) Speeding up what's now manual labor could only have beneficial consequences, beyond the UE.
He doesn't have to market them. They're patented: somebody else can (should, would) produce items using them. (Providing they're useful...&, knowing Reed, I suspect many of them aren't, except for pure science.)I mean, Reed Richards would make Jeff Bezos look only somewhat rich from all the money he should make if he bothered to actually market his inventions. There's a reason why the "Reed Richards is useless" trope exists.
OTOH, given Reed, & Kang, have developed time travel...
Also, AIUI, Reed is established to be rich: he owned the Baxter Building, at one time; IDK if he had Four Freedoms built for him & FF or not. (Not enough an FF fan.)
As for "is this ASB?", IDK... I keep getting threads moved when I don't think it warrants...