The reason not to is that it could narrow the buyers you would attract as many find it disturbing to be reminded of those that have passed. Whenever you purchase a property that is "out of the norm" it will narrow the buying public, however, there is always a buyer for every property. So when it is time to sell, take into consideration that it may take extra time and marketing.
Are you looking to purchase near a cemetery?
Ask them for their help.
"What/why did you decide to buy there?
"What do they like most about living there?
"What are the area features or anmentites they like most?
Ask the same questions of the owner.
Then create the benefits or solutions strategy.
Consider the option of getting a buyer into the hosue with an FHA backed mortgage at 40% of listed price. No, seller does not reduce the price.
If you see a value or benefit in making such an offer, you should get the details.