There is also what was mentioned that sometimes the items they choose to buy will not sell on the new server of their choosing. Sure you can do all the research you want, watch the markets of the server you plan to go to, check the previous listings and what they sold for, but that doesn't guarantee that what you buy on your old server will sell for that amount on your new one.

I've watched markets back when I used to do what I mentioned above on an item worth 30k consistently on another server and I made a bunch of said item only to find out when I transfer the price dropped to 5k with no sign of going back up. It's a gamble. But why not eliminate the gamble for those who want to truthfully transfer to a lower population server where they can actually purchase a house?