You need to think more comprehensively. Money comes and goes, but that splash greets you every morning when you're making coffee for eternity. You better love her.

no one can answer that because diff fabricators quote diff prices. someone in NYC is going to pay more than someone in Podunk MO.

you have to consider the depth of using a quartz slab on a backsplash. standard tile is 3/8" a slab could be well over 1". so how are you going to deal /wthe edges, around windows, etc.

It all comes down to what you like. Cost isn't going to vary much. 1-2K ? maybe? (after you purchase the extra slab and pay for fabricating) depending on size.

It's not like you'll have to pay 10K more for a slab. (unless you're using a very high end slab) on the flip side, if you're buying tile that costs $75 a sq foot, and now have to pay for install, it could run you more.

why not contact a stone place get a quote, and contact a tile setter and get their quote? this way you aren't guessing

Yes, it starts the same price as the counter. Then add the extra template and extra trip charge. And thecadditional charge for support, and for adfirional setting materials, and extra, extra, extra.

A quality basic tile job starts at 1-2K, depending on location. Extras depend on, the deviation from simple and flat. Tiny misplaced mosaics, glass, beveled edges, zellige, or other non standard materials cost more.

Quartz can also be scorched behind a stove.

"Quartz can also be scorched behind a stove."

Only when the appliance has not been installed per the manufactrurer's instructions. Let's not blame engineered stone manufacturers and fabricators/installers for the mistakes of kitchen designers please.