Ok, let me break down a scenario for you.
You meet a seller with two pins at his house, say two T2's. For simplicity, we will refer to them as T2(a) and T2(b).
You exam them both, and they are identical in every way. "Wow!", you exclaim to the seller. "Both of these machines are beautiful representations". The seller nods in agreement, and blurts suddenly, "they sure is, ain't they".
"How much are you asking for the pins?", you inquisitively ask.
You are shocked by the sellers answer! He states, "Well, this here pin (T2a) I am asking $1800. "And the other?", you inquire.
"Oh, that one over there (T2b), you mean. I would need at least $2,500"
"$2,500!", you gasp as you choke on your own spittle.
"What's the difference between the two?", you state in disbelief.
"Well, these two pins are HUO (you inwardly chuckle), but this here pin (T2b) has just been shopped out three months ago. You know, shopping a pin takes lots of time. You gotta buy some Novus to clean the playfield. I gotta order new rubbers from ********, plus I have to pay shipping. You know, back when I was your age, shipping cost a dime. These here rubbers cost me $5 dollars to ship. I used to be able to buy 50 Coca Colas with $5 dollars back in the day. But anyway, I digress. The reason for the price difference is this here little shop job."
"But I really want this pin here!", you point to the T2(b). "Can I get it for $1800 as well?"
"Damn here boy, you listen to me, you hear. I just been done telling you about the shop job, the rubbers, the Novox, and all 'em Coca Colas. This is what I have been reading on that there website Pinside.com, especially that Blackbeard character. He's kind of a wanker, but he sure knows his stuff. Boy, back were I am from, we would call you a tire kicker"
Exasperated, you walk away, feeling like you had just finished being in a Twilight Zone episode.
This is the kind of issue that the OP is addressing. I hope it helps. I have had enough of this thread already. That's all I have to say about THAT!