Current most expensive world is 17 milion kamas. I checked all .
17 million and it's not 24 hours yet till auction started? Welp people really got 999+ billion kamas from selling dupped shit so then don't care about such prices and we can see some retarded prices at last day... this is beyond stupid and Ankama should rethink this whole HW auction system
One, they would need enough funds to do so in their guild bank (as you can only bid up to what you have in there).
Two, their guild cannot be in possession of a Haven World (as no guild can own two).
Three, they can only bid on a single Haven World at a time.
Four, only once they have been outbid, can they either make a new bid, or bid on a different world.
In other words, it is highly unlikely that they are bidding on worlds just to inflate the price. More than likely, they are trying to buy a world for their guild, but want to buy it the cheapest possible. So they are going around and bidding on which ever Haven World has the lowest bid. Once out bid, they check all the worlds to find the cheapest and bid again. If my guild did not have a Haven World, we would do the same as to try and save as much kama as possible.
However, if you think a guild is, as you say trying to inflate all the prices for no reason, then just don't outbid them. If you don't, they cannot bid on a different world (just outbid them on the last day, last hour, if you want to try and get the World).
If I remember right, you cannot cancel your bid once you've made it (cannot check, already have a Haven World as I said before), therefore if you decide you actually don't want a bid there, your only choice is to hope someone outbids you.