The only way I would do it is if it was such an awesome property. Ex: lake front rural property in a rather isolated area with year round road access. Basically, I would see that as such a big plus that I'd be willing to take lack of broadband as a tradeoff. I would not expect to even have it in such a property though. Otherwise when I was house hunting, availability of DSL or cable was a must. Now we have fibre for overhead fed homes. I see that more as a bonus than a must though. I'd go back to DSL if I really had to.
What I'd probably do if I got a property without internet is I would just look into satellite, or build a tower and setup a point to point link to somewhere that does have internet, and work some kind of deal with the property owner.