A good logical reason for me to have a suppressor would be to install one one my nightstand G17. It'd keep me from damaging my hearing, should I have to fire it inside.
FWIW, if you can find a local p.d., sheriff's dept, etc., that has a suppressor that they'll sell to you, you can buy it, via form 5, with no transfer tax. Same applies to pre-86 f.a. weapons.