Given that cost does not appear to have been a prohibitive factor in DM's purchases, why would he select the smallest of the available incinerator models available from this company with a feeder chute too small to accomodate a normal human? Actually, it would be reasonable if someone were considering the disposal of chicken bodies. Another targeted user put forward by the company is LE, by which one assumes is can be used in the disposal of marijuana plants, etc. Could this activity have been going on at the Ayr property?
However, MSM provided that DM's stated intention was to build a home there.
http://globalnews.ca/news/561827/who-is-dellen-millard/
There hasn't been any mention of whether he also intended to tear down the barn, but it doesn't look like a particularly attractive addition to a country dream home. There is, of course, the normal amount of vegetation debris associated with clearing land and the large amount of trash generated when anyone builds a house. The costs for constant junk removal are significant, even in an urban build. In a rural situation, burning this debris on site sounds like a good idea, imo.
However, I note that Waterloo District has strict regulation regarding open air burning.
http://www.northdumfries.ca/en/ourtownship/BurnPermits.asp
To some extent these concerns can be alleviated by the use of an approved "burn barrel".
http://www.mnr.gov.on.ca/stdprodconsume/groups/lr/@mnr/@affm/documents/document/270519.pdf
However, the use of burn barrels is also highly controversial because of pollution and safety issues (particularly runaway fires caused by sparking and incompletely burned debris.) Far better IMO, if one can afford it, to buy a completely enclosed incinerator that burns at much higher temperatures thus alleviating both problems and reducing trash to a much smaller size.
For all these reasons IMHO the whole advance purchase of an incinerator to dispose of multiple murdered bodies meme ends up being a diversionary red herring. MOO.