Folks who buy vintage revolvers say they didn't pay too much, they just bought too early. Enjoy your new pen, and remember that a bottle of good ink is about $12, a converter is at least $15, and a leather slipcase could be as much at $25+.
If pen prices continue what they have been doing over the last decade or so, your pen won't look quite so overpriced.
Around 15 years ago, when I was at the height of my pen collecting, I used to visit an antiques mall.
Top-notch Parker 51's were £12, and Sheaffer Imperials were £6 (I lived in England at the time).
The guy used to have mugs full of pens. I was flat broke at the time, so I wasn't able to buy every pen I liked. I passed up a PFM for £25 because I didn't have the money. I could have bought at least 20 51's for £8-£12 each.
I break out in a cold sweat whenever I think about it.
I bought a mint (boxed and re-sac'ed) green Duofold Senior from a pen dealer's website for £40, and that was a big splurge for me.
The dealer was more expensive, because he was a pen dealer, but I was willing to go so high(!) because I really wanted a Duofold.
What I am saying is that pens will generally increase in value, and that you must expect to pay more from a dealer who specializes in pens.
You probably would never have found that pen 'in the wild', so you were paying, not just for the pen, but a 'finder's fee' to the dealer.
She had to find the pen, add it to her inventory, and turn up at the pen show to make it available to you.
You can't expect that to happen for free.
If you search around antique shops or trawl ebay for weeks, you probably could have got a better deal, but you will never have the added value of the choice and convenience of buying from a dealer.
I think you made out ok.
You overpaid a little on the 'raw' value of the pen, but you gained choice, convenience, and a couple of useful items thrown in for good measure.
In 15 years' time, you will be gloating to yourself that you only paid $160 for it, plus the fact that you will have had 15 years of use out of it too.
It's a good pen. Use it in good health