While I agree that including price in a review should be avoided simply because the value will be different in a matter of months and comment irrelevant, I have a line I'm not willing to cross. Yes, it depends on length, complexity, etc.

There is a reason why I wouldn't pay $60 for FTL *. Because the game doesn't have demo and it simply doesn't have enough content to be worth of it. The developer didn't even have to pay for costly engine. These 60 dollars are an outcome of me working x hours at my job, so I'm considering what I spend it on.

Do you want potential buyers rather stay silent about why they don't buy something they're otherwise interested in? If a discussion comes to it and price is the only reason why I'm not buying now, I say it. Because it's at least an indicator why the store does minus one sale.

Lately I have heard a lot how a game is art and one doesn't judge art by price. Yes, it's all nice and sweet but I doubt anyone would spend hundreds of dollars on cinema ticket of an unknown 30 minutes long movie just because of the art.

I understand it's more about how it irritates you. I have a weak spot for "We (all fans) think it was horrible...". Just my two cents.

* It's a hypothetic example; I have nothing against the game; it's enjoyable.

Movies are severely overpriced in most cases though. I've only seen a handful during the last couple of years where I've actually though I got my money's worth. Hence, I rarely go to cinemas, because I always feel like my money could have been spent on better things.

And herein lies the core of the price comparison. Money could be spent on better things. Would I be happier with this game, or something else of similar value?
It gets even easier when you have very similar products (of similar quality level, obviously). Why would I pay 20€ for a product if I can get a similar and equally good product for 10€? And those 10€ products teach me that the value of such a product is roughly 10€, so I expect future similar products to be in roughly that price range. If there is only 10€ product in a sea of 20€ products, then I'll view the 10€ as exceptionally cheap, but if the reverse is true, I'll view the 20€ products as overly expensive.
I guess this is why people complain about Rollercoaster Tycoon 3 being overpriced, as Rollercoaster Tycoon 2 is such a similar product, and the increase in quality between 2 & 3 is marginal at best.

Then there is the personal factor. I'm willing to pay more for a game that I expect to get a lot of enjoyment out of compared to a game that I'll pick up once or twice, have a bit of fun with and then never play again, or a "filler" game, something that I'll play between major games.
And while I can't put an exact price on enjoyment, I do expect to get "more" enjoyment out of a game like say Skyrim than a game like say Quake or To the Moon (both good games), thus Skyrim is worth more to me than those two titles.

I tend to do a lot of research before buying any game with the odd impulsive exception and that was only because I had some birthday money (for the record, it was Prototype 2).

Primarily, I look at the price and then I look at reviews to try to filter out consistent opinions. Then I align the games stregthns to my preferences. The only time I really pay close attention to "it's not worth x £'s" is when a game has been marketed and advertised extensively as these are often overpriced.

Its all subjective. I prefer longer quality games, than games which last 2-3 hours - i feel ripped off, even more so if it was a high priced game.
I pay as little as i can get away with for games - AAA or otherwise.

well firstly, it is not the price on its own, it is the price compared to.....
Just like sports cars, it is never the price on its own, it is the price compared to the alternatives.

Secondly, age has far larger effect on price than anything, so you could get a top game for virtually nothing just because it is old.... well we all already know this, hence the reason for joining GOG!

Less relevant anecdote.... I remember in the days of Video hire, i could tell which was the good new release movies (if i didn't already know) by the number of copies on the shelf! New releases with only 1 copy on the shelf would always without failure be utter crap. There was only 1 exception.... a movie called Amistad. Never heard of it when i saw it on the new release shelf, only 1 copy,,,, watched it, was totally blown away by how brilliant,.... one of the best all time brilliant movies i have ever seen!