If I advertise the same condition mowers you sell Norm and ask $50 here I just gets lots of lowball offers for $25.
On the other hand I've seen people with a Briggs and Stratton 4 stroke mower with a thrown rod and they
part the mower out and sell the parts on eBay and make $100.
As for the intake tubes getting rubbed through or breaking from memory all the ones I've had like that are from bolts
coming loose or dropping out ,people never do any maintenance to their mower small chunks of the blades
break off or they bend something blade related and the out of balance motor shakes bolts loose ,I've had a lot of motors
with loose manifold bolts ,loose carby / tank mounting bolts ,loose cowl bolts and quite a lot that the bolts
were missing ,when the parts are loose the manifold breaks or wears through.
Cheers
Max.