This is mainly about FC wards as RMT ppl can't resell personal plots.
If one scours the housing ward listings, checking each FC plot, you'll find that a majority are held by what appears to be bot accounts, approaching 80% in datacenters like Dynamis. Typically 1-4 members, and the plot name has been renamed from a default like 'Plot4-23' to '####4-23' where the #### is the FC's nick(to keep organized on a spreadsheet, no doubt). Even after selling the plot, now showing a more reasonable number of members and some even online, the new owners don't think to rename the actual plot name so can deduce they likely bought the plot from the RMT folks. 3rd party sites often sell medium FC plots for around $800 and large for $2,000.
When premium large FC plots come up for lottery, one often sees the bids jump dramatically overnight a day before the lottery cycle ends and if you wait up for the wee hours to monitor such a plot, you can sometimes catch the procession of tiny 4-member FC's popping in rapid fire to bid on the plot. Yes, some FC's are big enough and rich enough to have a large number of members bid (which is fine) but that is not what happens in most cases involving large FC plots.
There are also plenty of ppl with personal solo 4-member FC's hunting the plots but that is a lesser issue.
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Suggestion:
For medium FC plots up for lottery, require the applying FC's to have at least 10 members, with at least 10 showing sustained membership for the prior 30 days. For large FC plots up for bid, make that 17 and the rules above. It's a bit more work for the code validating the bid, but hardly a load on the server give the scarcity of these plots.
This approach will put a lot of pressure on the RMT bot FC's, as they appear to normally shuffle members around to prep FC's for bidding. Tying up their bot armies to stay locked into a specific FC at the suggested numbers and time period should crimp them considerably, not to mention stiffing solo FC plot hunters.
I strongly urge SE to think this thru before unlocking the remaining 6 wards in Dynamis worlds if it will include FC sections. Having virtually sealed the FC plots in Dynamis(aside from Ishgard small FC plots), the bots appear to be grabbing even personal plots to lock down wards, likely in an effort to add pressure to unlock the last 6 wards.