A village belongs somewhere. Oh sure, you could burn it down, but it would be missed eventually. Plus, that's "murder".
Leave no evidence I say.
I am planning to buy up some exotic Elven pleasure slaves and sacrifice them. I'll kill them in the sacrifice with negative energy, then bleed them out and collect the spilled blood. The bodies will rise, and the collected blood will be separate materials for the ooze. See....whether you can kill a slave or not all depends under whose "laws" you are under in the campaign setting. So technically even if someone comes to my doorstep after finding me out I can just argue I was totally legit, like anyone else where I bought them. I will not use up all of them though, I will give some to my selected officers, and guys that do well in non-negotiable "marriage".
Wights... Oh Wights.
Why purpose Elven pleasure slaves? You have all of those nice little handy villages around to turn and burn as you see fit, making yourself some wights...
And you mean it would be difficult for your 20th level Evil Cleric to cover up a little villacide? Nah.. I think he'll be ok. And all of those wights make one hell of a boarding party

Also... Why use slaves when you can oppress locals? An Evildoer oppressing the locals of a small village? Pssh, you're under the radar of the Epics going about, it is just a hamlet after all. Find nice villages far out of range of your domain to Teleport into, bring along one wight, spawn up 5-6 wights, and then jump back. Spend 1000GP and Teleportation Circle? If you have a Wizard you can pay off or who serves as a cohort pay them in lovely pleasure slaves and have them cast permanency on three Teleportation Circles that let out in a hostile location where you hold sway. Figure 33,000 for each Circle... But you have created a plausibly deniable little hideaway and run-away/run-to for all of your escape hatch needs.
You have a hidden Circle a couple of hundred miles away off the beaten path near a trade route. Every once in awhile you put a couple wights in coffins, tell them to hush until the lid opens, and offer a nice little piece of change for the transportation of your grandfather/daughter/etc. The Wight is dropped off, knows where and what it is doing, and have your trusted Wight bring back a dozen or so travelers who won't be missed.
They travel by night, hide themselves in the day, and take the two or three days back to the Circle and freedom.
Expensive? Yes, moreso than wiping out a village. Is it worth covering your behind until the group of adventurers comes in. Then you have that fancy tile of sending or an alarm beacon go off. Poor CR appropriate adventurers.. Noone ever expects the near-epic cleric to sweep in, kill and create, and bring back the Band of the Iron Lances as the new motley wights for his pleasure pits

Slainte,
-Loonook.