Coin is easy to farm. I suppose they could charge "hoard" lol
a random auction is probably fairest. But also a minimum price to bid, to be considered in the random auction. Something like say 1gp, so that total newb players aren't snagging plots they may not deserve ( in the eyes of others. I can agree they may not be able to develop a plot for quite awhile and plots shouldn't just be "free"), but within reach for most players ( 1gp is just a suggested amount)
I for one hope we get to inspect, tour, view all the plots for a week before any bidding/auctioning/selling starts
I got a nice plot with my guild right now, Lairs will need to be pretty spiffy for me to want to get one. But I am hoping they are.