TL;DR I skimmed through a lot of the discussion.
If I may so point out, this doesn't really seem like a necessary argument to have
It more seems like a way for this Selvester3 fellow to "advertise" his wares to the people on the forum board without having to advertise directly in the bazaar.
In essence, he's winning either way right now, even if your argument against his set-up is valid.
@Dirt
The idea Marthicus was talking about is specifically to get people to play the levels before Basil so they can buy recipes. He is saying to allow us to say that we WANT to go to Basil, and thus it should ignore all parties which are too far down for Basil to sell to us if we join them.
Current system, it puts you in the party with open space closest to the top of the tier you select. If that means they are in the middle of fighting Vanaduke because that is the ONLY party with open space... then you join mid-Vanaduke battle!
With an option like this, the party system would see you want to shop at Basil, so ignore every party which is closer than 2 levels from him (I think that was the rule, right?). So if that Vanaduke party is the only group available, it sends you to the top of the tier and lets you lead an empty party and wait for other random joiners.
So it isn't a change in the intent of the rules, it is just a better implementation of them.