Buying items in town is pretty much the point. The auctions happen when they happen a the table avoids descending into a shopping session where the party's diplomancer or rogue just makes the pain worse for everyone else.That sounds fine for buying items in town but it would make party treasury division, if done fairly by value, an absolute nightmare! You wouldn't be able to bid on anything because you'd have no way of knowing what your share value was going to be.
When it comes to the party saying "huh none of us want this, let's sell it & split the gold" there isn't much friction since it isn't factored into the split until everyone gets a share.
If someone does want it just use whatever price list you are using (or DMG or one of the examples thrown out by others).






