In response to the OP, I don't own multiple houses. I think purchasing multiple plots is disrespectful, personally. Note that while I don't have access to a FC house, I don't begrudge people who have access to two (one a "public" FC house that they may or may not be the owner of record for, and one a personal house). Beyond that, though? Pure disrespect.

A couple of other things.

1.) One of the typical responses to the Mateus incident is that the plots lay vacant for ages, so why should people care? That's hogwash. SE didn't time their transfer windows for a quiet mid-expansion cycle; they timed it for an expansion launch. There were countless returning players, freshly interested in FFXIV, who were likely also freshly interested in housing. Now, they don't have options anymore, on Mateus at least. That's ridiculous. If it were six months into Stormblood, I think this line of defence would be valid, but given the timing of SE's incentives, it's not applicable.

2.) The blame for all of this shouldn't fall on the players. Are they disrespecting others and being self-centered? Yeah, sure - but welcome to life. That's their right. They fully deserve criticism over it, but unlike real life, FFXIV is a completely manicured environment - and it is SE at fault here, as usual. They should have locked houses to one per account, possibly one per account per server - or better yet, not offered limited f*cking housing in the first godsdamned place. Every other MMO has managed it, why can't they? They also should never have disrupted the population levels of smaller servers like Mateus so quickly and thoughtlessly. Keep in mind here, SE had years to react to the overpopulation of servers like Balmung. Despite this, they couldn't even be bothered to lock those servers to transfers, or completely shut down character creation. They couldn't be bothered to upgrade their server hardware when moving data centres so that they could handle the larger worlds. Now, because of their delay in addressing overpopulation, and their sh*tty implementation of houses, we have this scenario. They caused it. They should fix it.