Just because the Jacobsen can do it faster doesn't mean you can do it for dirt cheap.
That jacosbsen has a much higher initial investment. You are dealing with dozens of hydraulic lines, etc... which are susceptible to leaks and the like. More fuel. Expensive repairs. Hard to find a backup in case of major failure.
Then factor in this is the only property you have to use it on, what if you lose the bid?
I've been tossing around the idea of buying one, but I just can't justify it unless I went after a whack of work requiring it. Those machines just are not worth owning unless it's running most of the week.