But TBH, I'm not wild about their cheap maple cabs (too much color variations on the doors). 

So we had both slab and pier and beam in soil with high clay content and pretty extreme seasonal moisture and heat variation.

., if you are using asphalt shingles, they typically come with lots of variation in the actual shingle.

It's possible that as you say the sellor's realtor was not interested or he did not understand it.So as has been suggested rework the offer and re present the new variation.  

Yes, it certainly, is... and there are at least a dozen variations, from a straight or "pure" option, cooperative and sandwich LOs, to hybrids I won't mention, here... and "lease purchase," which is technically a different animal, as well...

The wild west is in the $1,000,000 to $3,000,000 range where there are hundreds of variations.

No one can predict costs and values that close and small variations will kill you.

Do not nickel and dime tax variations.

Watch the market place forums too, it's the "Count Down To Launch" LOL.There are several types of conventional options, the "full credit", "step up", "financed option" (actually 2 ways), "set up option" "declining credit option"  each having acceptable variations and the American Option (a favorite of the gurus) and the European Option described, both may employ aspects of the different types. 

That includes running the numbers with lots of variation; don't assume just one number.