"The tile store said not to seal the marble,"???? Whaaaaat? Hmmmm. Somethings henky.

Marble REALLY needs sealing. The sealing won't change the gloss level. The sealing prevents STAINS from things like urine, toothpaste, shampoo, hair dye, etc. It also allows the marble to keep an even colour distribution when wet. It doesn't stop etching (like water droplets hitting the surface)...it stops COLOUR transfer.

Many experts suggest sealing marble tiles BEFORE they are installed and then MULTIPLE TIMES afterwards (before you use the space). Which is why I think the advice above is a bit wonky.

I think you need to speak with a STONE expert...not 'tile' people. Tiles are porcelain/ceramic = basic approach to maintenance. Marble is stone = very SPECIFIC maintenance needs = needs a stone expert to let you know how to do this.

Maybe Joseph will pop by with some suggestions...he deals with with counter tops, etc, all the time.

I hear you. The marble will be sealed if I use it. Actually thinking, after what you said and what I've read elsewhere, selecting marble was a bad idea. Started out intending porcelain but couldn't find what we were looking for so opted for this as the house has other decorative Carrera marble elements.