I'm not one of those who thinks mods don't increase the value of a Pin, they at least make it more desirable compared to ones without, and I mean decent upgrades, not plastic tat stuck everywhere.
In future I'll most likely move things like shakers, speaker upgrades and cooling fans etc. from Pin to Pin. If buyers don't value them then they shouldn't mind them being removed.
But Mods are Marmite, some people will value a pin with them, some wont care at all and not think them worth adding anything to the value.