The thought of spending $1000 to have it polished rather freaked me out, too.
Seems that would depend on several factors. Now, if I had had my sword appraised and had been told that it was worth $20,000 in full polish...I would have scrimped and scraped for a year or so to raise the $2000 to get a fully trained master polisher to do the job. And then sold that windfall. I wouldn't have the cash to get such a polish done if I wanted to keep the blade
I could barely justify the polish, reproduction fittings, and reproduction furniture on my $3k to $4k blade and that took me about a year to get the money together. But then it took them about a year to do the work, too.
To get a handle on the cost of polishing, Japanese water stones are used. These stones are themselves very costly. The blade is polished completely with successively finer stones. All the work is done by hand
Do a bit of research about preserving the blade. Don't use synthetic oils on the steel. Clove oil is best. NEVER try to clean any portion of the blade, hilt, fittings, or furniture yourself...the red, brown, or black patina on the hilt of the blade is supposed to be there and the value of the blade will be completely destroyed if it is removed.
Looked at an old blade once in Japanese Imperial Navy WWII fittings. Given the compostion of naval officers in WWII, there is about an 80% chance of that blade being an old, valuable blace. I removed the handle, the tsuka, and gawked at the blade. Someone had take sandpaper and totally removed the patina from the hilt.
They didn't believe me when I told them they had destroyed the value of the blade and that I would give them $50 bucks for it and was probably wasting my money. Thought I was trying to cheat them. Left it there.