I'm glad I moved exclusively to fives, much less effort than swapping basses, swapping tunings, fitting D tuners and relearning to play around the new positions.
You've nailed the part most people miss, in an acoustic setting you could probably ditch all the amps if you set the speakers up slightly further back than you would a vocal only pa. That's tight stage area space saved and no need to upgrade for larger gigs where you can use on stage amps along with the 735s running harder.
Buy cheap, buy twice.
I don't think it should be compulsory but those that don't add it need to be aware that they may get less interest in an item, every Modulus 5 that comes up has been somewhere outside of the uk and I've passed them by, I'm gas free but if one popped up near me I might be tempted for example.
I can't see why you'd leave the rough location off the advert on a collection only item or one likely to receive requests for viewings, just extra messages to reply to.
The only thing to be aware of is that if you go to a normal DB you are unlikely to have strength in your pinky to 'stop' a note unless it had very low tension strings, it's easy to damage your hands on the DB.
Tu español parace bien, yo entiendo todo. Solo visitamos cada año un vez o dos, principalmente costa calida, me gusta españa y estudiar la lengua para dos o tres años, ¡mi español es fatal tambien!